Json/XML/HTML数据解析

浏览数：39 / 时间：2015年06月09日

Json数据解析

https://code.google.com/p/google-gson/ 谷歌官方的jjson解析类库Gson

http://www.jsonschema2pojo.org/ 该网站能将Json数据解析为POJO(简单的java对象)。

1、单个对象

假设json数据如下：

{
    "id": 100,
    "body": "It is my post",
    "number": 0.13,
    "created_at": "2014-05-22 19:12:38"
}

通过网站自动解析得到的POJO如下（created_at被序列化为符合java规范的驼峰结构）：

package com.example;

import javax.annotation.Generated;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

@Generated("org.jsonschema2pojo")
public class Example {

@Expose
private Integer id;
@Expose
private String body;
@Expose
private Float number;
@SerializedName("created_at")
@Expose
private String createdAt;

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getBody() {
return body;
}

public void setBody(String body) {
this.body = body;
}

public Float getNumber() {
return number;
}

public void setNumber(Float number) {
this.number = number;
}

public String getCreatedAt() {
return createdAt;
}

public void setCreatedAt(String createdAt) {
this.createdAt = createdAt;
}

}

最后就可以序列化了：

Example  foo = new Gson().fromJson(JSON_DATA, Example.class); //Example为POJO类

2、对象的嵌套

假设json数据如下：

{
    "id": 100,
    "body": "It is my post",
    "number": 0.13,
    "created_at": "2014-05-22 19:12:38",
    "foo2": {
        "ids": 200,
        "name": "haha"
    }
}

通过网站自动解析得到的POJO如下:

-----------------------------------com.example.Example.java-----------------------------------

package com.example;

import javax.annotation.Generated;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

@Generated("org.jsonschema2pojo")
public class Example {

@Expose
private Integer id;
@Expose
private String body;
@Expose
private Double number;
@SerializedName("created_at")
@Expose
private String createdAt;
@Expose
private Foo2 foo2;

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getBody() {
return body;
}

public void setBody(String body) {
this.body = body;
}

public Double getNumber() {
return number;
}

public void setNumber(Double number) {
this.number = number;
}

public String getCreatedAt() {
return createdAt;
}

public void setCreatedAt(String createdAt) {
this.createdAt = createdAt;
}

public Foo2 getFoo2() {
return foo2;
}

public void setFoo2(Foo2 foo2) {
this.foo2 = foo2;
}

}
-----------------------------------com.example.Foo2.java-----------------------------------

package com.example;

import javax.annotation.Generated;
import com.google.gson.annotations.Expose;

@Generated("org.jsonschema2pojo")
public class Foo2 {

@Expose
private Integer ids;
@Expose
private String name;

public Integer getIds() {
return ids;
}

public void setIds(Integer ids) {
this.ids = ids;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

}

最后就可以序列化了：

Example  foo = new Gson().fromJson(JSON_DATA, Example.class); Foo为POJO类

3、对象数组

假设json数据如下：

[{
    "id": 100,
    "body": "It is my post1",
    "number": 0.13,
    "created_at": "2014-05-20 19:12:38"
},
{
    "id": 101,
    "body": "It is my post2",
    "number": 0.14,
    "created_at": "2014-05-22 19:12:38"
}]

使用网站自动解析得到POJO：

package com.example;

import javax.annotation.Generated;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

@Generated("org.jsonschema2pojo")
public class Example {

@Expose
private Integer id;
@Expose
private String body;
@Expose
private Float number;
@SerializedName("created_at")
@Expose
private String createdAt;

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getBody() {
return body;
}

public void setBody(String body) {
this.body = body;
}

public Float getNumber() {
return number;
}

public void setNumber(Float number) {
this.number = number;
}

public String getCreatedAt() {
return createdAt;
}

public void setCreatedAt(String createdAt) {
this.createdAt = createdAt;
}

}

这种解析有两种方法：

1、解析成数组：

Example[] foos = new Gson().fromJson(JSON_DATA, Example[].class);

2、解析成list：

Type listType = new TypeToken<ArrayList<Example>>(){}.getType();
ArrayList<Example> foos = new Gson().fromJson(JSON_DATA, listType);

XML数据解析

http://www.xmlpull.org/ pull解析器下载

http://kxml.sourceforge.net/ kxml包

假设我们的XML数据如下：

<root>
    <student id="1" group="1">
        <name>张三</name>
        <sex>男</sex>
        <age>18</age>
        <email>[email protected]</email>
        <birthday>1987-06-08</birthday>
        <memo>好学生</memo>
    </student>
    <student id="2" group="2">
        <name>李四</name>
        <sex>女</sex>
        <age>18</age>
        <email>[email protected]</email>
        <birthday>1987-06-08</birthday>
        <memo>好学生</memo>
    </student>
    <student id="3" group="3">
        <name>小王</name>
        <sex>男</sex>
        <age>18</age>
        <email>[email protected]</email>
        <birthday>1987-06-08</birthday>
        <memo>好学生</memo>
    </student>
    <student id="4" group="4">
        <name>小张</name>
        <sex>男</sex>
        <age>18</age>
        <email>[email protected]</email>
        <birthday>1987-06-08</birthday>
        <memo>好学生</memo>
    </student>
    <student id="5" group="5">
        <name>小明</name>
        <sex>男</sex>
        <age>18</age>
        <email>[email protected]</email>
        <birthday>1987-06-08</birthday>
        <memo>好学生</memo>
    </student>
</root>

Xml对应的实体bean文件:

public class Student {
    
    private int id;
    private int group;
    private String name;
    private String sex;
    private int age;
    private String email;
    private String memo;
    private String birthday;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public int getGroup() {
        return group;
    }
    public void setGroup(int group) {
        this.group = group;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getMemo() {
        return memo;
    }
    public void setMemo(String memo) {
        this.memo = memo;
    }
    public String getBirthday() {
        return birthday;
    }
    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }
    
}

Pull解析代码：

package com.parsexml;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

import com.parsexml.entity.Student;

public class PullParseXml {
    
    
    public List<Student> PullParseXML(){
        
        List<Student> list=null;
        Student student = null;
        
        //构建XmlPullParserFactory
        try {
            XmlPullParserFactory pullParserFactory=XmlPullParserFactory.newInstance();
            //获取XmlPullParser的实例
            XmlPullParser xmlPullParser=pullParserFactory.newPullParser();
            //设置输入流  xml文件
            xmlPullParser.setInput(inputStream,"UTF-8"); //inputStream为网络上的到的XML格式的输入流
            
            //开始
            int eventType=xmlPullParser.getEventType();
            
            try {
                while(eventType!=XmlPullParser.END_DOCUMENT){
                    String nodeName=xmlPullParser.getName();
                    switch (eventType) {
                    //文档开始
                    case XmlPullParser.START_DOCUMENT:
                        list=new ArrayList<Student>();
                        break;
                    //开始节点
                    case XmlPullParser.START_TAG:
                        //判断如果其实节点为student
                        if("student".equals(nodeName)){
                            //实例化student对象
                            student=new Student();
                            //设置Id属性
                            student.setId(Integer.parseInt(xmlPullParser.getAttributeValue(0)));
                            //设置Group属性
                            student.setGroup(Integer.parseInt(xmlPullParser.getAttributeValue(1)));
                        }else if("name".equals(nodeName)){
                            //设置name
                            student.setName(xmlPullParser.nextText());
                        }else if("sex".equals(nodeName)){
                            //设置sex
                            student.setSex(xmlPullParser.nextText());
                        }else if("age".equals(nodeName)){
                            //设置age
                            student.setAge(Integer.parseInt(xmlPullParser.nextText()));
                        }else if("email".equals(nodeName)){
                            //设置email
                            student.setEmail(xmlPullParser.nextText());
                        }else if("birthday".equals(nodeName)){
                            //设置birthday
                            student.setBirthday(xmlPullParser.nextText());
                        }else if("memo".equals(nodeName)){
                            //设置memo属性
                            student.setMemo(xmlPullParser.nextText());
                        }
                        break;
                    //结束节点
                    case XmlPullParser.END_TAG:
                        if("student".equals(nodeName)){
                            list.add(student);
                            student=null;
                        }
                        break;
                    default:
                        break;
                    }
                    eventType=xmlPullParser.next();
                }
            } catch (NumberFormatException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (XmlPullParserException e) {
            e.printStackTrace();
        }

        return list;
    }
    
    public static void main(String[] args) {
        List<Student> list=new PullParseXml().PullParseXML();
        for(Student student:list){
            System.out.println("id:"+student.getId()+"\tgroup:"+student.getGroup()+"\tname:"+student.getName()+"\tsex:"+student.getSex()+"\tage:"+student.getAge()+"\temail:"+student.getEmail()+"\tbirthday:"+student.getBirthday()+"\tmemo:"+student.getMemo());
        }
    }
    
}