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基于JAVA标注实现统一的前台后台

发布时间:2013-04-07 作者:电脑知识网 来源:www.sogoupc.com 字号:
基于JAVA标注实现统一的前台(JS层)后台(JAVA层)想法[/b]
通过标注的方式进行前后台的统一验证的好处是很多的,增强前后台验证的一致性,减少代码的重复,不需要前台与一份验证,后台再写一份了。

本人想基于这种方式写一个基于Annotation的完整的Validator的开源的小框架,但发现要做的事情很多,工作量很大,要一点一点的来,一点一点的完善,最后闲时写了个大 概,与大家一起探讨,

通过JAVA标注将前台和后台的验证规则标到JAVA的值对象的类中。
Validator在初始化的过程中,一次性读入JAVA的值对象的类中验证规则的标注信息,并生成前台需要的校验的JS文件。
前台页面可以直接引入自动生成的校验的JS文件,进行校验。a
后台得到从前台请求request绑定好值的JAVA的值对象,通过AnnotationValidator类进行验证。

以下是Annotation标注的代码。

进行不可以为空的校验标注

@Retention (RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)

public @interface CanNotNull {

}

进行是否是整数的校验标注

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface IsInteger {
public int minWidth() default 1;
public int maxWidth() default Integer.MAX_VALUE;
public int minValue() default Integer.MIN_VALUE;
public int maxValue() default Integer.MAX_VALUE;

}

用于添写字段中文的标注



@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface FieldDesc {
public String value();

}

验证器的代码:

package com.javaest.validity.process;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.javaest.util.StringUtils;
import com.javaest.validity.annotation.CanNotNull;
import com.javaest.validity.annotation.FieldDesc;
import com.javaest.validity.annotation.IsInteger;
import com.javaest.validity.test.pojo.Student;

public class PojoBeanAnnotationValiditer {
private static Map allValidityRuleMap = new HashMap();
private static Map allFieldDescMap = new HashMap();
private static String jsValiditerFilePath;
private static String[] pojoBeanPackageName;
/**
*
将指定的包下边的所有Pojo类的标注信息一次性的读取到Map中,以备以后验证对象时使用
*/
public static void loadAllClassAnnotationValidityInfoInPackage(String[] packageNameArr)
throws IllegalArgumentException, SecurityException, IllegalAccessException, NoSuchMethodException,
InvocationTargetException, ClassNotFoundException, IOException {
for (int i = 0; i < packageNameArr.length; i++) {
List classList = ReflectUtils.getAllClassInPackage(packageNameArr[i]);
for (int j = 0; j < classList.size(); j++) {
Class currClass = classList.get(j);
String classFullName = currClass.getPackage().getName() + "." + currClass.getName();
Map[] validityRuleMapAndFieldDescMap = loadValidityRuleAndCreateValidityJsFile(currClass);
allValidityRuleMap.put(classFullName, validityRuleMapAndFieldDescMap[0]);
allFieldDescMap.put(classFullName, validityRuleMapAndFieldDescMap[1]);
}
}
}
/*
* 对具体的一个类的标注做处理,读入字段描述 信息,读入非空验证信息,读入整数验证信息,并根据这些信息生成JS代码。
*/

private static Map[] loadValidityRuleAndCreateValidityJsFile(Class currClass) throws IllegalArgumentException,
IllegalAccessException, SecurityException, NoSuchMethodException, InvocationTargetException, IOException {
StringBuffer validityCanNotNullJsStrBuf = new StringBuffer();
StringBuffer validityIsIntegerJsStrBuf = new StringBuffer();
Field[] fieldArr = currClass.getDeclaredFields();
List canNotNullFieldNameList = new ArrayList();
List isIntegerValiditerRuleInfoList = new ArrayList();
Map fieldDescMap = new HashMap();
for (int i = 0; i < fieldArr.length; i++) {
String currFieldName = fieldArr[i].getName();
//读入字段描述 信息
FieldDesc fieldDescAnnotation = fieldArr[i].getAnnotation(FieldDesc.class);
if (fieldDescAnnotation != null) {
String fieldDesc = fieldDescAnnotation.value();
System.out.println(fieldDesc);
fieldDescMap.put(currFieldName, fieldDesc);
}
else {
fieldDescMap.put(currFieldName, currFieldName);
}
//读入非空验证信息
if (fieldArr[i].isAnnotationPresent(CanNotNull.class)) {
canNotNullFieldNameList.add(currFieldName);
validityCanNotNullJsStrBuf.append("if(document.all." + currFieldName + ".value.trim()==\"\"){alert('"
+ fieldDescMap.get(currFieldName) + "不可以为空'); }\n");
}
//读入整数验证信息
IsInteger isIntegerAnnotation = fieldArr[i].getAnnotation(IsInteger.class);
if (isIntegerAnnotation != null) {
int minWidth = isIntegerAnnotation.minWidth();
int maxWidth = isIntegerAnnotation.maxWidth();
int minValue = isIntegerAnnotation.minValue();
int maxValue = isIntegerAnnotation.maxValue();
IsIntegerValiditerRuleInfo isIntegerValiditerRuleInfo = new IsIntegerValiditerRuleInfo(currFieldName,
minWidth, maxWidth, minValue, maxValue);
isIntegerValiditerRuleInfoList.add(isIntegerValiditerRuleInfo);
if (minWidth > 0) {
validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName
+ ".value.length() }
if (maxWidth < Integer.MAX_VALUE) {
validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName
+ ".value.length()>maxWidth){alert('" + fieldDescMap.get(currFieldName) + "宽度太长!'); }\n");
}
if (minValue > Integer.MIN_VALUE) {
validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName + ".value*1 + fieldDescMap.get(currFieldName) + "的数值太小!'); }\n");
}
if (maxValue < Integer.MAX_VALUE) {
validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName + ".value*1>maxValue){alert('"
+ fieldDescMap.get(currFieldName) + "的数值太大!'); }\n");
}
}
}
Map classValidityRuleMap = new HashMap();
classValidityRuleMap.put("canNotNullFieldNameList", canNotNullFieldNameList);
classValidityRuleMap.put("isIntegerValiditerRuleInfoList", isIntegerValiditerRuleInfoList);
//根据这些信息生成JS代码
BufferedWriter jsFileWriter = new BufferedWriter(new FileWriter(new File(jsValiditerFilePath
+ java.io.File.separator + currClass.getName() + ".js")));
jsFileWriter.write(validityCanNotNullJsStrBuf.toString());
jsFileWriter.write(validityIsIntegerJsStrBuf.toString());
jsFileWriter.close();
return new Map[] { classValidityRuleMap, fieldDescMap };

}
/*
* 具体的后台验证过程
*/

public static ValidityResult validity(Object currObj) throws IllegalArgumentException, IllegalAccessException,
SecurityException, NoSuchMethodException, InvocationTargetException {
Class aClass = currObj.getClass();
String classFullName = aClass.getPackage().getName() + "." + aClass.getName();
Field[] fieldArr = aClass.getDeclaredFields();

Map validityRuleMap = allValidityRuleMap.get(classFullName);
Map fieldDescMap = allFieldDescMap.get(classFullName);
List canNotNullFieldNameList = (List) validityRuleMap.get("canNotNullFieldNameList");
List isIntegerValiditerRuleInfoList = (List) validityRuleMap.get("isIntegerValiditerRuleInfoList");
ValidityResult validityResult = new ValidityResult();
for (int j = 0; j < canNotNullFieldNameList.size(); j++) {
String currFieldName = (String) canNotNullFieldNameList.get(j);
String getMethodName = "get" + currFieldName.substring(0, 1).toUpperCase() + currFieldName.substring(1);
Method getFieldValueMethod = aClass.getMethod(getMethodName);
String fieldValue = ((String) getFieldValueMethod.invoke(currObj));
if (fieldValue == null || fieldValue.equals("")) {
System.out.println(fieldDescMap.get(currFieldName) + " 不可以为空 ! ");
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 不可以为空 ! ");
}
}

for (int j = 0; j < isIntegerValiditerRuleInfoList.size(); j++) {
IsIntegerValiditerRuleInfo isIntegerValiditerRuleInfo = (IsIntegerValiditerRuleInfo) isIntegerValiditerRuleInfoList
.get(j);
String currFieldName = isIntegerValiditerRuleInfo.getFieldName();
String getMethodName = "get" + currFieldName.substring(0, 1).toUpperCase() + currFieldName.substring(1);
Method getFieldValueMethod = aClass.getMethod(getMethodName);
String fieldValue = ((String) getFieldValueMethod.invoke(currObj));
int minWidth = isIntegerValiditerRuleInfo.getMinWidth();
int maxWidth = isIntegerValiditerRuleInfo.getMaxWidth();
int minValue = isIntegerValiditerRuleInfo.getMinValue();
int maxValue = isIntegerValiditerRuleInfo.getMaxValue();

if (StringUtils.isInteger(fieldValue)) {
if (fieldValue.length() < minWidth) {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 宽度不可以小于 " + minWidth + "! ");
}
if (fieldValue.length() > maxWidth) {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 宽度不可以大于 " + maxWidth + "! ");
}
if (Integer.parseInt(fieldValue) < minValue) {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 的值不可以小于 " + minValue + "! ");
}
if (Integer.parseInt(fieldValue) > maxValue) {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 的值不可以大于 " + maxValue + "! ");
}

}
else {

validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 必须是整数格式 ! ");

}
}
return validityResult;

}

public static String[] getPojoBeanPackageName() {
return pojoBeanPackageName;
}

public static void setPojoBeanPackageName(String[] pojoBeanPackageName) {
PojoBeanAnnotationValiditer.pojoBeanPackageName = pojoBeanPackageName;
}

public static String getJsValiditerFilePath() {
return jsValiditerFilePath;
}

public static void setJsValiditerFilePath(String jsValiditerFilePath) {
PojoBeanAnnotationValiditer.jsValiditerFilePath = jsValiditerFilePath;
}

public static void main(String[] args) throws IllegalArgumentException, IllegalAccessException, SecurityException,
NoSuchMethodException, InvocationTargetException, ClassNotFoundException, IOException {
PojoBeanAnnotationValiditer.setPojoBeanPackageName(new String[] { "com.javaest.validity.test.pojo" });
PojoBeanAnnotationValiditer.setJsValiditerFilePath("JS\\VALIDITY");
PojoBeanAnnotationValiditer
.loadAllClassAnnotationValidityInfoInPackage(new String[] { "com.javaest.validity.test.pojo" });
Student aStudent = new Student();
aStudent.setAddress("吉林省长春市二道区");
aStudent.setId("");
aStudent.setAge("9");
ValidityResult validityResult = PojoBeanAnnotationValiditer.validity(aStudent);
}

}
package com.javaest.validity.process;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.javaest.util.StringUtils;
import com.javaest.validity.annotation.CanNotNull;
import com.javaest.validity.annotation.FieldDesc;
import com.javaest.validity.annotation.IsInteger;
import com.javaest.validity.test.pojo.Student;
public class PojoBeanAnnotationValiditer {
private static Map allValidityRuleMap = new HashMap();
private static Map allFieldDescMap = new HashMap();
private static String jsValiditerFilePath;
private static String[] pojoBeanPackageName;
/**
*
将指定的包下边的所有Pojo类的标注信息一次性的读取到Map中,以备以后验证对象时使用
*/
public static void loadAllClassAnnotationValidityInfoInPackage(String[] packageNameArr)
throws IllegalArgumentException, SecurityException, IllegalAccessException, NoSuchMethodException,
InvocationTargetException, ClassNotFoundException, IOException {
for (int i = 0; i < packageNameArr.length; i++) {
List classList = ReflectUtils.getAllClassInPackage(packageNameArr[i]);
for (int j = 0; j < classList.size(); j++) {
Class currClass = classList.get(j);
String classFullName = currClass.getPackage().getName() + "." + currClass.getName();
Map[] validityRuleMapAndFieldDescMap = loadValidityRuleAndCreateValidityJsFile(currClass);
allValidityRuleMap.put(classFullName, validityRuleMapAndFieldDescMap[0]);
allFieldDescMap.put(classFullName, validityRuleMapAndFieldDescMap[1]);
}
}
}
/*
* 对具体的一个类的标注做处理,读入字段描述 信息,读入非空验证信息,读入整数验证信息,并根据这些信息生成JS代码。
*/
private static Map[] loadValidityRuleAndCreateValidityJsFile(Class currClass) throws IllegalArgumentException,
IllegalAccessException, SecurityException, NoSuchMethodException, InvocationTargetException, IOException {
StringBuffer validityCanNotNullJsStrBuf = new StringBuffer();
StringBuffer validityIsIntegerJsStrBuf = new StringBuffer();
Field[] fieldArr = currClass.getDeclaredFields();
List canNotNullFieldNameList = new ArrayList();
List isIntegerValiditerRuleInfoList = new ArrayList();
Map fieldDescMap = new HashMap();
for (int i = 0; i < fieldArr.length; i++) {
String currFieldName = fieldArr[i].getName();
//读入字段描述 信息
FieldDesc fieldDescAnnotation = fieldArr[i].getAnnotation(FieldDesc.class);
if (fieldDescAnnotation != null) {
String fieldDesc = fieldDescAnnotation.value();
System.out.println(fieldDesc);
fieldDescMap.put(currFieldName, fieldDesc);
}
else {
fieldDescMap.put(currFieldName, currFieldName);
}
//读入非空验证信息
if (fieldArr[i].isAnnotationPresent(CanNotNull.class)) {
canNotNullFieldNameList.add(currFieldName);
validityCanNotNullJsStrBuf.append("if(document.all." + currFieldName + ".value.trim()==\"\"){alert('"
+ fieldDescMap.get(currFieldName) + "不可以为空'); }\n");
}
//读入整数验证信息
IsInteger isIntegerAnnotation = fieldArr[i].getAnnotation(IsInteger.class);
if (isIntegerAnnotation != null) {
int minWidth = isIntegerAnnotation.minWidth();
int maxWidth = isIntegerAnnotation.maxWidth();
int minValue = isIntegerAnnotation.minValue();
int maxValue = isIntegerAnnotation.maxValue();
IsIntegerValiditerRuleInfo isIntegerValiditerRuleInfo = new IsIntegerValiditerRuleInfo(currFieldName,
minWidth, maxWidth, minValue, maxValue);
isIntegerValiditerRuleInfoList.add(isIntegerValiditerRuleInfo);
if (minWidth > 0) {
validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName
+ ".value.length()}
if (maxWidth < Integer.MAX_VALUE) {
validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName
+ ".value.length()>maxWidth){alert('" + fieldDescMap.get(currFieldName) + "宽度太长!'); }\n");
}
if (minValue > Integer.MIN_VALUE) {
validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName + ".value*1+ fieldDescMap.get(currFieldName) + "的数值太小!'); }\n");
}
if (maxValue < Integer.MAX_VALUE) {
validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName + ".value*1>maxValue){alert('"
+ fieldDescMap.get(currFieldName) + "的数值太大!'); }\n");
}
}
}
Map classValidityRuleMap = new HashMap();
classValidityRuleMap.put("canNotNullFieldNameList", canNotNullFieldNameList);
classValidityRuleMap.put("isIntegerValiditerRuleInfoList", isIntegerValiditerRuleInfoList);
//根据这些信息生成JS代码
BufferedWriter jsFileWriter = new BufferedWriter(new FileWriter(new File(jsValiditerFilePath
+ java.io.File.separator + currClass.getName() + ".js")));
jsFileWriter.write(validityCanNotNullJsStrBuf.toString());
jsFileWriter.write(validityIsIntegerJsStrBuf.toString());
jsFileWriter.close();
return new Map[] { classValidityRuleMap, fieldDescMap };
}
/*
* 具体的后台验证过程
*/
public static ValidityResult validity(Object currObj) throws IllegalArgumentException, IllegalAccessException,
SecurityException, NoSuchMethodException, InvocationTargetException {
Class aClass = currObj.getClass();
String classFullName = aClass.getPackage().getName() + "." + aClass.getName();
Field[] fieldArr = aClass.getDeclaredFields();
Map validityRuleMap = allValidityRuleMap.get(classFullName);
Map fieldDescMap = allFieldDescMap.get(classFullName);
List canNotNullFieldNameList = (List) validityRuleMap.get("canNotNullFieldNameList");
List isIntegerValiditerRuleInfoList = (List) validityRuleMap.get("isIntegerValiditerRuleInfoList");
ValidityResult validityResult = new ValidityResult();
for (int j = 0; j < canNotNullFieldNameList.size(); j++) {
String currFieldName = (String) canNotNullFieldNameList.get(j);
String getMethodName = "get" + currFieldName.substring(0, 1).toUpperCase() + currFieldName.substring(1);
Method getFieldValueMethod = aClass.getMethod(getMethodName);
String fieldValue = ((String) getFieldValueMethod.invoke(currObj));
if (fieldValue == null || fieldValue.equals("")) {
System.out.println(fieldDescMap.get(currFieldName) + " 不可以为空 ! ");
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 不可以为空 ! ");
}
}
for (int j = 0; j < isIntegerValiditerRuleInfoList.size(); j++) {
IsIntegerValiditerRuleInfo isIntegerValiditerRuleInfo = (IsIntegerValiditerRuleInfo) isIntegerValiditerRuleInfoList
.get(j);
String currFieldName = isIntegerValiditerRuleInfo.getFieldName();
String getMethodName = "get" + currFieldName.substring(0, 1).toUpperCase() + currFieldName.substring(1);
Method getFieldValueMethod = aClass.getMethod(getMethodName);
String fieldValue = ((String) getFieldValueMethod.invoke(currObj));
int minWidth = isIntegerValiditerRuleInfo.getMinWidth();
int maxWidth = isIntegerValiditerRuleInfo.getMaxWidth();
int minValue = isIntegerValiditerRuleInfo.getMinValue();
int maxValue = isIntegerValiditerRuleInfo.getMaxValue();
if (StringUtils.isInteger(fieldValue)) {
if (fieldValue.length() < minWidth) {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 宽度不可以小于 " + minWidth + "! ");
}
if (fieldValue.length() > maxWidth) {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 宽度不可以大于 " + maxWidth + "! ");
}
if (Integer.parseInt(fieldValue) < minValue) {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 的值不可以小于 " + minValue + "! ");
}
if (Integer.parseInt(fieldValue) > maxValue) {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 的值不可以大于 " + maxValue + "! ");
}
}
else {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 必须是整数格式 ! ");
}
}
return validityResult;
}
public static String[] getPojoBeanPackageName() {
return pojoBeanPackageName;
}
public static void setPojoBeanPackageName(String[] pojoBeanPackageName) {
PojoBeanAnnotationValiditer.pojoBeanPackageName = pojoBeanPackageName;
}
public static String getJsValiditerFilePath() {
return jsValiditerFilePath;
}
public static void setJsValiditerFilePath(String jsValiditerFilePath) {
PojoBeanAnnotationValiditer.jsValiditerFilePath = jsValiditerFilePath;
}
public static void main(String[] args) throws IllegalArgumentException, IllegalAccessException, SecurityException,
NoSuchMethodException, InvocationTargetException, ClassNotFoundException, IOException {
PojoBeanAnnotationValiditer.setPojoBeanPackageName(new String[] { "com.javaest.validity.test.pojo" });
PojoBeanAnnotationValiditer.setJsValiditerFilePath("JS\\VALIDITY");
PojoBeanAnnotationValiditer
.loadAllClassAnnotationValidityInfoInPackage(new String[] { "com.javaest.validity.test.pojo" });
Student aStudent = new Student();
aStudent.setAddress("吉林省长春市二道区");
aStudent.setId("");
aStudent.setAge("9");
ValidityResult validityResult = PojoBeanAnnotationValiditer.validity(aStudent);
}
}


下边是一个加好了标注的Student类


public class Student {
@CanNotNull
@FieldDesc("姓名")
private String name;
@CanNotNull
@FieldDesc("性别")
private String sex;
@IsInteger(minValue=18,maxValue=60)
@CanNotNull
@FieldDesc("年龄")
private String age;
@CanNotNull
@FieldDesc("编码")
private String id;
private String address;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
。。。。。。。。。。
}
文章: 基于JAVA标注实现统一的前台后台
地址:http://www.sogoupc.com/pcbc/201304/2964.html
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