8种常用json解析示例（原创作者：smallbee 本文转载于：http://smallbee.iteye.com/）

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//转换器GsonBuilder builder = new GsonBuilder(); // 不转换没有 @Expose 注解的字段 builder.excludeFieldsWithoutExposeAnnotation();Gson gson = builder.create(); //1、对象转stringStudent stu = new Student();stu.setStudentId(333);stu.setStudentName("qqq");String stuStr = gson.toJson(stu);System.out.println(stuStr); //{"studentName":"qqq","studentId":333}//2、string转对象Student user2 = gson.fromJson(stuStr, Student.class); System.out.println(user2); String stuTemp = "{\"studentName\":\"qqq2\",\"studentId\":3335}";Student user4 = gson.fromJson(stuTemp, Student.class); System.out.println(user4); //3、对象List转stringList<Student> testBeanList = new ArrayList<Student>(); Student testBean = new Student(); testBean.setStudentId(555);testBean.setStudentName("552");testBeanList.add(testBean); //Gson gsonList = new Gson(); Type type = new TypeToken<List<Student>>(){}.getType();  //指定集合对象属性String beanListToJson = gson.toJson(testBeanList, type); System.out.println(beanListToJson); //[{"studentName":"552","studentId":555}] //集合string转对象listList<Student> testBeanListFromJson = gson.fromJson(beanListToJson, type); System.out.println(testBeanListFromJson); //[555:552]//4、集合如果不指定类型 默认为StringList<String> testList = new ArrayList<String>(); testList.add("first"); testList.add("second"); String listToJson = gson.toJson(testList); System.out.println(listToJson); //["first","second"] //5、集合字符串转回来需要指定类型List<String> testList2 = (List<String>) gson.fromJson(listToJson, new TypeToken<List<String>>() { }.getType()); System.out.println(testList2); //6、 将HashMap字符串转换为 JSON Map<String, String> testMap = new HashMap<String, String>(); testMap.put("id", "id.first"); testMap.put("name", "name.second"); String mapToJson = gson.toJson(testMap); System.out.println(mapToJson); //{"id":"id.first","name":"name.second"}//7、stringMap转对象Map<String, String> userMap2 = (Map<String, String>) gson.fromJson(mapToJson, new TypeToken<Map<String, String>>() { }.getType()); System.out.println(userMap2); //{id=id.first, name=name.second} //8、对象含有普通对象、集合、map情况Student user1 = new Student(); user1.setStudentId(1001); user1.setStudentName("张三"); Student user3 = new Student(); user3.setStudentId(1002); user3.setStudentName("李四"); Map<String, Student> userMap = new HashMap<String, Student>(); userMap.put("user1", user1); userMap.put("user3", user3); List<Student> userList = new ArrayList<Student>(); userList.add(user1); userList.add(user3); Teacher groupBean = new Teacher(); groupBean.setStudent(user1);groupBean.setStus(userList);groupBean.setMap((HashMap)userMap);//groupBean.setUserList(userList); Gson gsonGroup = new Gson(); String sGroupBean = gsonGroup.toJson(groupBean, new TypeToken<Teacher>() { }.getType()); System.out.println(sGroupBean); /*{"stus":[{"studentName":"张三","studentId":1001},{"studentName":"李四","studentId":1002}],"student":{"studentName":"张三","studentId":1001},"map":{"user3":{"studentName":"李四","studentId":1002},"user1":{"studentName":"张三","studentId":1001}},"id":0,"age":0}*/

        //9、复杂对象string转对象Teacher groupBean2 = (Teacher) gson.fromJson(sGroupBean, new TypeToken<Teacher>() { }.getType()); System.out.println(groupBean2); 

 

package com.andtools;import com.google.gson.annotations.Expose;public class Student {@Exposeprivate String studentName;@Exposeprivate int studentId;public Student(){}public Student(int studentId,String studentName){this.setStudentId(studentId);this.setStudentName(studentName);}public String toString(){return this.getStudentId() + ":" + this.getStudentName();}public String getStudentName() {return studentName;}public void setStudentName(String studentName) {this.studentName = studentName;}public int getStudentId() {return studentId;}public void setStudentId(int studentId) {this.studentId = studentId;}}

 

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