来自蚂蚁课堂。
1.项目添加依赖。
<!-- 添加阿里巴巴解析json工具类 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.1.26</version> </dependency>
2.JSONTest.java
import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import com.alibaba.fastjson.JSONArray; import com.alibaba.fastjson.JSONObject;
public class JSONTest { public static void main(String[] args) { // setJSON(); // setFastJSON(); // setMapToJSON(); // setBeanToJSON(); // analysisJson(); jsonToBean(); } /** * 通过传统方式自己拼接字符串JSON */ public static void setJSON() { String str = " { "errorCode": "0","errorMsg": "调用接口成功","data": [{"userName": "余胜军","position": "蚂蚁课堂创始人","webAddres": "www.itmayiedu.com" },{ "userName": "周安旭","position": "蚂蚁课堂合伙人","webAddres": "www.itmayiedu.com" } ]}"; System.out.println(str); } /** * 通过fastJSON封装JSON */ public static void setFastJSON() { JSONObject root = new JSONObject(); root.put("errorCode",0); root.put("errorMsg","调用接口成功"); JSONArray dataArr = new JSONArray(); JSONObject userYushengjun = new JSONObject(); userYushengjun.put("userName","余胜军"); userYushengjun.put("position","蚂蚁课堂创始人"); userYushengjun.put("webAddres","www.itmayiedu.com"); dataArr.add(userYushengjun); root.put("data",dataArr); System.out.println(root.toJSONString()); } /** * 通过map转换成json */ static public void setMapToJSON() { HashMap<String,Object> root = new HashMap<String,Object>(); root.put("errorCode","调用接口成功"); List<Map<String,String>> dataArr = new ArrayList<Map<String,String>>(); Map<String,String> userYushengjun = new HashMap<String,String>(); userYushengjun.put("userName","www.itmayiedu.com"); Map<String,String> itmayiedu = new HashMap<String,String>(); itmayiedu.put("userName","余胜军1"); itmayiedu.put("position","蚂蚁课堂创始人1"); itmayiedu.put("webAddres","www.itmayiedu.com"); dataArr.add(itmayiedu); dataArr.add(userYushengjun); root.put("data",dataArr); System.out.println(new JSONObject().toJSONString(root)); } /** * 通过实体类转换JSON */ static public void setBeanToJSON() { RootEntity rootEntity = new RootEntity(); rootEntity.setErrorCode("0"); rootEntity.setErrorMsg("调用接口成功"); List<UserEntity> data = new ArrayList<UserEntity>(); UserEntity userEntity = new UserEntity(); userEntity.setPosition("蚂蚁课堂创始人"); userEntity.setUserName("余胜军"); userEntity.setWebAddres("itmayiedu.com"); data.add(userEntity); rootEntity.setData(data); System.out.println(new JSONObject().toJSONString(rootEntity)); } /** * 解析JSON */ static public void analysisJson() { String jsonStr = "{ "errorCode": "0","webAddres": "www.itmayiedu.com" } ]}"; // 将json字符串转换成json JSONObject root = new JSONObject().parSEObject(jsonStr); String errorCode = root.getString("errorCode"); String errorMsg = root.getString("errorMsg"); System.out.println("errorCode:" + errorCode + ",errorMsg:" + errorMsg); JSONArray dataArr = root.getJSONArray("data"); for (int i = 0; i < dataArr.size(); i++) { JSONObject dataBean = (JSONObject) dataArr.get(i); String position = dataBean.getString("position"); String userName = dataBean.getString("userName"); String webAddres = dataBean.getString("webAddres"); System.out.println("position:" + position + ",userName:" + userName + ",webAddres:" + webAddres); } } /** * 通过JSON转实体类 */ static public void jsonToBean() { String jsonStr = "{ "errorCode": "0","webAddres": "www.itmayiedu.com" } ]}"; // 将json字符串转换成json RootEntity rootEntity = new JSONObject().parSEObject(jsonStr,RootEntity.class); System.out.println(rootEntity.toString()); } }
3.RootEntity.java
private String errorCode; private String errorMsg; private List<UserEntity> data; public String getErrorCode() { return errorCode; } public void setErrorCode(String errorCode) { this.errorCode = errorCode; } public String getErrorMsg() { return errorMsg; } public void setErrorMsg(String errorMsg) { this.errorMsg = errorMsg; } public List<UserEntity> getData() { return data; } public void setData(List<UserEntity> data) { this.data = data; } @Override public String toString() { return "RootEntity [errorCode=" + errorCode + ",errorMsg=" + errorMsg + ",data=" + data + "]"; }
4.UserEntity.java
public class UserEntity { private String position; private String userName; private String webAddres; public String getPosition() { return position; } public void setPosition(String position) { this.position = position; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getWebAddres() { return webAddres; } public void setWebAddres(String webAddres) { this.webAddres = webAddres; } @Override public String toString() { return "UserEntity [position=" + position + ",userName=" + userName + ",webAddres=" + webAddres + "]"; } (编辑:李大同)
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