fastJson使用

来源：互联网发布：c语言中删除文件编辑：程序博客网时间：2024/05/20 06:40

对于服务端返回的json格式数据，解析的方案还是不比较多的，这里推荐 fastjson，原因是使用简单、效率还是比较高的

fastjson主要是我们在解析的时候要有对应的本地Bean来承接返回的jsonObject和jsonArray,直接通过一个例子来看看：

假设我们从服务端获取的数据为：

String response = "{\"id\":\"2\",\"name\":\"节点01\",\"open\":true,\"pId\":\"1\",\"tree\":{\"color\":\"gree\",\"tree\":true}}";

这是一个标准的json格式串，通过分析我们发现其结构分为两个部分：

一个外围的Bean，有基本属性id、name、open、tree,以及一个Bean类型的属性tree.这个内部的bean也有自己的属性color、tree

那我们就本地生成对应的bean

外部Bean:

package lavasoft.stu.json;public class Node {    private String id;    private String pId;    private String name;    private boolean open;    private Tree tree;    public Node(String id, String pId, String name, boolean open, Tree tree) {        super();        this.id = id;        this.pId = pId;        this.name = name;        this.open = open;        this.tree = tree;    }    public Node() {        // TODO Auto-generated constructor stub    }    public String getId() {        return id;    }    public void setId(String id) {        this.id = id;    }    public String getPId() {        return pId;    }    public void setPId(String pId) {        this.pId = pId;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public boolean isOpen() {        return open;    }    public void setOpen(boolean open) {        this.open = open;    }    public Tree getTree() {        return tree;    }    public void setTree(Tree tree) {        this.tree = tree;    }}

内部Bean:

package lavasoft.stu.json;public class Tree {    String color;    boolean isTree;    public Tree(String color, boolean isTree) {        super();        this.color = color;        this.isTree = isTree;    }    public Tree() {        // TODO Auto-generated constructor stub    }    public String getColor() {        return color;    }    public void setColor(String color) {        this.color = color;    }    public boolean isTree() {        return isTree;    }    public void setTree(boolean isTree) {        this.isTree = isTree;    }}

fastJson解析方法：

package lavasoft.stu.json;import java.util.HashMap;import java.util.Map;import com.alibaba.fastjson.JSON;public class MainTest {    public static void main(String[] args) {        // 对象构造        Node node = new Node("1", "12", "jone", false, new Tree("green", true));        String jsonStr = JSON.toJSONString(node);        System.out.println(jsonStr);        Node node3 = JSON.parseObject(jsonStr, Node.class);        System.out.println("FastJson解析结果[对象]" + node3.getName());        System.out.println("////////////////////////");        // 字符串构造        String response = "{\"id\":\"2\",\"name\":\"节点01\",\"open\":true,\"pId\":\"1\",\"tree\":{\"color\":\"gree\",\"tree\":true}}";        Node node4 = JSON.parseObject(response, Node.class);        System.out.println("FastJson解析结果【字符串】：" + " is tree: "                + node4.getTree().isTree() + "  **color:  "                + node4.getTree().getColor() + "**name: " + node4.getName()                + "**isopen: " + node4.isOpen());        // util方法构造        System.out.println("////////////////////////");        Map<String, Object> map = new HashMap<>();        map.put("color", "blue");        map.put("tree", true);        StringBuilder builder = new StringBuilder();        builder.append("{").append(buildJsonParamByStrObject("节点02", "name"))                .append(",").append(buildJsonParamByStrObject(true, "open"))                .append(",").append(buildJsonParamByMapObject(map, "tree"))                .append("}");        System.out.println("builder " + builder.toString());        Node node2 = JSON.parseObject(builder.toString(), Node.class);        System.out.println("FastJson解析结果【util】：" + " is tree: "                + node2.getTree().isTree() + "  **color:  "                + node2.getTree().getColor() + "**name: " + node2.getName()                + "**isopen: " + node2.isOpen());    }    /**     *      * 功能描述: <br>     * 〈功能详细描述〉 构造key:value 键值对     */    public static StringBuilder buildJsonParamByMapObject(            Map<String, Object> params, String key) {        StringBuilder builder = new StringBuilder();        String val = JSON.toJSONString(params);        builder.append("\"" + key + "\":" + val);        return builder;    }    /**     *      * 功能描述: <br>     * 〈功能详细描述〉 构造key:value 键值对     */    public static StringBuilder buildJsonParamByStrObject(Object params,            String key) {        StringBuilder builder = new StringBuilder();        String val = JSON.toJSONString(params);        builder.append("\"" + key + "\":" + val);        return builder;    }}

fastJson可以解析任何类型的基础数据类型例如int、 string、boolen

我写的一个小Demo http://download.csdn.net/detail/yaya_soft/8256245

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