android解析json

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我们先在apache-tomcat-9.0.0.M17\webapps\ROOT 中创建一个后缀为json 里面放些参数等下用来解析它如我们这用了一个students.json:

在导入一个包 fastjson-1.2.3.jar

因为我们要解析的对象是json 所以依据内容我们要创建两实体类。

Student实体类：

package com.example.g160628_android31_parsexml;/** * Created by Administrator on 2017/7/26 0026. */public class Student {    private int sid;    private String sname;    private String ssex;    public Student() {    }    public Student(int sid, String sname, String ssex) {        this.sid = sid;        this.sname = sname;        this.ssex = ssex;    }    public int getSid() {        return sid;    }    public void setSid(int sid) {        this.sid = sid;    }    public String getSname() {        return sname;    }    public void setSname(String sname) {        this.sname = sname;    }    public String getSsex() {        return ssex;    }    public void setSsex(String ssex) {        this.ssex = ssex;    }}

然后是BigObject实体类
package com.example.g160628_android31_parsexml;import java.util.List;/** * Created by Administrator on 2017/7/26 0026. */public class BigObject {    private int count;    private List<Student> students;    public BigObject() {    }    public BigObject(int count, List<Student> students) {        this.count = count;        this.students = students;    }    public int getCount() {        return count;    }    public void setCount(int count) {        this.count = count;    }    public List<Student> getStudents() {        return students;    }    public void setStudents(List<Student> students) {        this.students = students;    }}

最后是 MainActivity.java

package com.example.g160628_android31_parsexml;import android.os.AsyncTask;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import com.alibaba.fastjson.JSON;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.nio.channels.AsynchronousCloseException;import java.util.List;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void getJsonByNet(View view){        new MyJsonTask().execute();    }    class  MyJsonTask extends AsyncTask{        @Override        protected Object doInBackground(Object[] params) {            //获取网络json数据            String path="http://localhost:7788/students.json";            try {                URL url=new URL(path);                HttpURLConnection connection= (HttpURLConnection) url.openConnection();                //设置请求方式                connection.setRequestMethod("GET");                //设置请求超时的时间                connection.setConnectTimeout(5000);                //获取结果码                int code=connection.getResponseCode();                if(code==200){                    //获取数据                    InputStream is=connection.getInputStream();                    int len=0;                    byte[] buf=new byte[1024];                    StringBuffer stringBuffer=new StringBuffer();                    while ((len=is.read(buf))!=-1){                        String s=new String(buf,0,len);                        stringBuffer.append(s);                    }                    Log.i("test",stringBuffer.toString());                    //Gson   fastJson                    //解析Json                    BigObject bigObject=JSON.parseObject(stringBuffer.toString(),BigObject.class);                    int count=bigObject.getCount();                    List<Student> students=bigObject.getStudents();                    for (Student student : students) {                        Log.i("test",student.getSname()+""+student.getSsex());                    }                }            } catch (Exception e) {                e.printStackTrace();            }            return null;        }    }}

如果在手机上运行还要加个权限

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

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