The most simple, concise and efficient Json data parsing

1. No picture, no truth


2. Main code
1. Import jar package

Copy the fastjson.jar package to the project libs package

2. Package tool class JsonUtil.java

package com.example.parsejsondemo;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

import java.util.List;

/**
 * Json解析的工具类
 * 
 * @author 孤狼
 * @since 2015-8-8
 */

public class JsonUtil {

    /**
     * 将JSON转成 数组类型对象
     *
     * @param json
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> List<T> getListFromString(String json, Class<T> clazz) {
        List<T> t = null;
        try {
            t = JSON.parseArray(json, clazz);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return t;
    }

    /**
     * 将list转换成String
     *
     * @param list
     *            准备转换的集合
     * @return string
     * @throws Exception
     */
    public static String getStringFromList(List list) {
        String string = "";
        try {
            string = JSON.toJSONString(list, true);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return string;
    }

    /**
     * 将java对象转换成json字符串
     *
     * @param obj
     *            准备转换的对象
     * @return json字符串
     * @throws Exception
     */
    public static String getStringFromObject(Object obj) {
        String json = "";
        try {
            json = JSON.toJSONString(obj, true);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return json;
    }

    /**
     * 将json字符串转换成java对象
     *
     * @param json
     * @param clazz
     * @param <T>
     * @return object
     */
    public static <T> T getObjectFromString(String json, Class<T> clazz) {
        T t = null;
        try {
            t = JSON.parseObject(json, clazz);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return t;
    }

    /**
     * 将 json 字符串转为 JSONArray 对象;
     *
     * @param json
     * @return JsonArray
     */
    public static JSONArray getJsonArray(String json) {
        JSONArray array = null;
        try {
            array = JSON.parseArray(json);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return array;
    }

    /**
     * 将 json 字符串转为 JSONObect 对象
     *
     * @param json
     * @return JSONObject
     */
    public static JSONObject getJsonObject(String json) {
        JSONObject object = null;
        try {
            object = (JSONObject) JSON.parse(json);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return object;
    }
}

3. Encapsulate data entity classes (examples: ArticleBean.java and ArticleDetailBean.java)

package com.example.parsejsondemo;

import java.util.ArrayList;
import java.util.List;

/**
 * 文章实体类
 * 
 * @author 孤狼
 * @since 2015-8-8
 */
public class ArticleBean {

    private String title = "";
    private String title_image_url = "";
    private String create_time = "";
    private long article_id = 0;
    // 查看用户的信息
    private List<UserInfoBean> headimages = new ArrayList<UserInfoBean>();

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getTitle_image_url() {
        return title_image_url;
    }

    public void setTitle_image_url(String title_image_url) {
        this.title_image_url = title_image_url;
    }

    public String getCreate_time() {
        return create_time;
    }

    public void setCreate_time(String create_time) {
        this.create_time = create_time;
    }

    public List<UserInfoBean> getHeadimages() {
        return headimages;
    }

    public void setHeadimages(List<UserInfoBean> headimages) {
        this.headimages = headimages;
    }

    public long getArticle_id() {
        return article_id;
    }

    public void setArticle_id(long article_id) {
        this.article_id = article_id;
    }
}

package com.example.parsejsondemo;

import java.util.ArrayList;
import java.util.List;

/**
 * 文章详情
 * 
 * @author 孤狼
 * @since 2015-8-8
 */
public class ArticleDetailBean {

    private String content;
    // 图片集合类
    private List<ImageResult> images = new ArrayList<ImageResult>();
    private String create_time;
    // 点赞状态
    private boolean if_dianzan;
    // 评论数
    private int comment_num;
    // 第几期 例：第5期
    private String times;
    private String title;
    private long article_id;
    private int dianzan_num;

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String getCreate_time() {
        return create_time;
    }

    public void setCreate_time(String create_time) {
        this.create_time = create_time;
    }

    public boolean isIf_dianzan() {
        return if_dianzan;
    }

    public void setIf_dianzan(boolean if_dianzan) {
        this.if_dianzan = if_dianzan;
    }

    public int getComment_num() {
        return comment_num;
    }

    public void setComment_num(int comment_num) {
        this.comment_num = comment_num;
    }

    public String getTimes() {
        return times;
    }

    public void setTimes(String times) {
        this.times = times;
    }

    public long getArticle_id() {
        return article_id;
    }

    public void setArticle_id(long article_id) {
        this.article_id = article_id;
    }

    public int getDianzan_num() {
        return dianzan_num;
    }

    public void setDianzan_num(int dianzan_num) {
        this.dianzan_num = dianzan_num;
    }

    public List<ImageResult> getImages() {
        return images;
    }

    public void setImages(List<ImageResult> images) {
        this.images = images;
    }

    @Override
    public String toString() {
        return "ArticleDetailResult [title=" + title + ", content=" + content
                + ", create_time=" + create_time + ", comment_num="
                + comment_num + ", times=" + times + ", article_id="
                + article_id + ", dianzan_num=" + dianzan_num + "]";
    }

}

4. Call
a. Parse the JsonList type in the code

package com.example.parsejsondemo;

import java.util.List;

import com.nostra13.universalimageloader.core.ImageLoader;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

/**
 * 解析 JsonList类型
 *
 * @author 孤狼
 * @since 2015-8-8
 * */
public class JsonListActivity extends Activity {
    private String data = "[ { \"article_id\": 682, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"给你的一封情书\", \"title_image_url\": \"http://e.hiphotos.baidu.com/image/w%3D310/sign=d0aa9ba85eb5c9ea62f305e2e538b622/b90e7bec54e736d1cb1f21ab9e504fc2d5626901.jpg\" }, { \"article_id\": 681, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"女人，你的别名是愚蠢\", \"title_image_url\": \"http://f.hiphotos.baidu.com/image/w%3D310/sign=ef8e5a82778b4710ce2ffbcdf3cfc3b2/72f082025aafa40f1ed46c7eae64034f78f01906.jpg\" }, { \"article_id\": 680, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"明白\", \"title_image_url\": \"http://g.hiphotos.baidu.com/image/w%3D310/sign=5c6d742fe4fe9925cb0c6f5104a95ee4/3ac79f3df8dcd100dce594cb768b4710b8122fda.jpg\" }, { \"article_id\": 679, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"秋之随想\", \"title_image_url\": \"http://d.hiphotos.baidu.com/image/w%3D310/sign=f9fd8128e9c4b7453494b117fffd1e78/0bd162d9f2d3572ce2779bdd8813632762d0c31e.jpg\" }, { \"article_id\": 681, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"女人，你的别名是愚蠢\", \"title_image_url\": \"http://f.hiphotos.baidu.com/image/w%3D310/sign=ef8e5a82778b4710ce2ffbcdf3cfc3b2/72f082025aafa40f1ed46c7eae64034f78f01906.jpg\" }, { \"article_id\": 680, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"明白\", \"title_image_url\": \"http://g.hiphotos.baidu.com/image/w%3D310/sign=5c6d742fe4fe9925cb0c6f5104a95ee4/3ac79f3df8dcd100dce594cb768b4710b8122fda.jpg\" }, { \"article_id\": 679, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"秋之随想\", \"title_image_url\": \"http://d.hiphotos.baidu.com/image/w%3D310/sign=f9fd8128e9c4b7453494b117fffd1e78/0bd162d9f2d3572ce2779bdd8813632762d0c31e.jpg\" }, { \"article_id\": 681, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"女人，你的别名是愚蠢\", \"title_image_url\": \"http://f.hiphotos.baidu.com/image/w%3D310/sign=ef8e5a82778b4710ce2ffbcdf3cfc3b2/72f082025aafa40f1ed46c7eae64034f78f01906.jpg\" }, { \"article_id\": 680, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"明白\", \"title_image_url\": \"http://g.hiphotos.baidu.com/image/w%3D310/sign=5c6d742fe4fe9925cb0c6f5104a95ee4/3ac79f3df8dcd100dce594cb768b4710b8122fda.jpg\" }, { \"article_id\": 679, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"秋之随想\", \"title_image_url\": \"http://d.hiphotos.baidu.com/image/w%3D310/sign=f9fd8128e9c4b7453494b117fffd1e78/0bd162d9f2d3572ce2779bdd8813632762d0c31e.jpg\" }, { \"article_id\": 681, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"女人，你的别名是愚蠢\", \"title_image_url\": \"http://f.hiphotos.baidu.com/image/w%3D310/sign=ef8e5a82778b4710ce2ffbcdf3cfc3b2/72f082025aafa40f1ed46c7eae64034f78f01906.jpg\" }, { \"article_id\": 680, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"明白\", \"title_image_url\": \"http://g.hiphotos.baidu.com/image/w%3D310/sign=5c6d742fe4fe9925cb0c6f5104a95ee4/3ac79f3df8dcd100dce594cb768b4710b8122fda.jpg\" }, { \"article_id\": 679, \"create_time\": \"12:13\", \"headimages\": [], \"title\": \"秋之随想\", \"title_image_url\": \"http://d.hiphotos.baidu.com/image/w%3D310/sign=f9fd8128e9c4b7453494b117fffd1e78/0bd162d9f2d3572ce2779bdd8813632762d0c31e.jpg\" } ]";
    private List<ArticleBean> list;
    private ListView listView;
    private ImageLoader instance;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        instance = ImageLoader.getInstance();
        listView = (ListView) findViewById(R.id.listView);
        // 把String类型的json解析成List集合
        list = JsonUtil.getListFromString(data, ArticleBean.class);
        // 设置适配器
        listView.setAdapter(new CustomAdapter());
        listView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                startActivity(new Intent(JsonListActivity.this,
                        JsonObjectActivity.class));
            }
        });
    }

    // 定义适配器
    class CustomAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public Object getItem(int position) {
            return list.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // 查找控件
            ViewHold hold;
            if (convertView != null) {
                hold = (ViewHold) convertView.getTag();
            } else {
                hold = new ViewHold();
                convertView = View.inflate(getApplicationContext(),
                        R.layout.list_item, null);
                hold.iv_cover = (ImageView) convertView
                        .findViewById(R.id.iv_coner);
                hold.tv_time = (TextView) convertView
                        .findViewById(R.id.tv_time);
                hold.tv_title = (TextView) convertView
                        .findViewById(R.id.tv_title);
                convertView.setTag(hold);
            }
            // 填充数据
            hold.tv_time.setText("孤狼   发布时间:"
                    + list.get(position).getCreate_time());
            hold.tv_title.setText(list.get(position).getTitle());
            instance.displayImage(list.get(position).getTitle_image_url(),
                    hold.iv_cover);
            return convertView;
        }

        class ViewHold {
            private ImageView iv_cover;
            private TextView tv_title;
            private TextView tv_time;
        }
    }
}

b. Parse the JsonObject type

package com.example.parsejsondemo;

import com.nostra13.universalimageloader.core.ImageLoader;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * 解析 JsonObject类型
 *
 * @author 孤狼
 * @since 2015-8-8
 * */
public class JsonObjectActivity extends Activity {
    // json数据
    private String data = "{ \"article_id\": 682, \"comment_num\": 26, \"content\": \"你是清晨，\\r\\n是我醒来后的第一缕，\\r\\n是我起床后的第一缕清风，\\r\\n是我看见的第一抹浓绿色。\\r\\n你是的阳光温暖我的。\\r\\n你是中午，\\r\\n是手中香甜的饭菜，\\r\\n是我午睡时躺着的枕头。\\r\\n你是晚上，\\r\\n是黑中的一屡凉爽，\\r\\n是黑暗中的平静心态，\\r\\n是惊恐中的心灵安慰。\\r\\n是天空中的闪烁繁星，\\r\\n你是我最遥远的，\\r\\n我的恋人。\\r\\n\", \"create_time\": \"06-12 12:13\", \"dianzan_num\": 411, \"if_dianzan\": true, \"images\": [ { \"image_id\": 3595, \"image_url\": \"http://e.hiphotos.baidu.com/image/w%3D310/sign=d0aa9ba85eb5c9ea62f305e2e538b622/b90e7bec54e736d1cb1f21ab9e504fc2d5626901.jpg\" }, { \"image_id\": 3596, \"image_url\": \"http://7xjora.com2.z0.glb.qiniucdn.com/644121332662Etjmn.jpg?imageView2/0/w/500/h/500\" }, { \"image_id\": 3597, \"image_url\": \"http://7xjora.com2.z0.glb.qiniucdn.com/1650121333675aY09a.jpg?imageView2/0/w/500/h/500\" }, { \"image_id\": 3598, \"image_url\": \"http://7xjora.com2.z0.glb.qiniucdn.com/120712133440245oBv.jpg?imageView2/0/w/500/h/500\" }, { \"image_id\": 3599, \"image_url\": \"http://7xjora.com2.z0.glb.qiniucdn.com/940121334941gy1Ii.jpg?imageView2/0/w/500/h/500\" } ], \"times\": \"第682期\", \"title\": \"给你的一封情书\" }";
    private ImageLoader instance;
    private TextView tv_title;
    private TextView tv_time;
    private ImageView iv_cover;
    private ArticleDetailBean detailBean;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_object);
        instance = ImageLoader.getInstance();
        iv_cover = (ImageView) findViewById(R.id.iv_coner);
        tv_time = (TextView) findViewById(R.id.tv_time);
        tv_title = (TextView) findViewById(R.id.tv_title);
        // 把json数据解析成Object类型实体类
        detailBean = JsonUtil
                .getObjectFromString(data, ArticleDetailBean.class);
        // 填充数据
        tv_title.setText(detailBean.getTitle());
        tv_time.setText(detailBean.getContent());
        instance.displayImage(detailBean.getImages().get(0).getImage_url(),
                iv_cover);
    }

}

3. Description

Json data is one of the main forms of interaction between the client and the server. There are also many methods and tools for parsing Json, such as goole's Gson (you can see the previous method of parsing data with Gson), etc., while fastjson.jar parses json data. Very powerful, efficient and concise. The utility is very simple: introduce the jar package -> encapsulate the tool class - -> encapsulate the data object to be parsed -> call the tool to parse. The code is very simple, if you have any questions, please leave a message - Lone Wolf

4. Example Demo

The most simple, efficient, concise and easy-to-use Json parsing