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XStream的简单使用

發(fā)布時(shí)間：2024/9/19 综合教程 49 生活家

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XStream

XStream是一個(gè)java對(duì)象和xml相互轉(zhuǎn)換的工具

創(chuàng)建XStream對(duì)象：XStream stream = new XStream()
Java對(duì)象轉(zhuǎn)換成xml：stream .toXML(...)
xml轉(zhuǎn)換成Java對(duì)象：stream .fromXML(...)

轉(zhuǎn)換裝配方式

DomDriver方式：new XStream(new DomDriver());
StaxDriver方式：new XStream(new StaxDriver());
XppDriver，默認(rèn)方式，但是xpp方式經(jīng)常解析xml會(huì)出錯(cuò)

Java轉(zhuǎn)XML

1.導(dǎo)入jar

xmlpull_1_0_5.jar
xpp3_min-1.1.4c.jar
xstream-1.4.4.jar

2.測(cè)試類

 1 public class TestC {
 2     /**
 3      * 控制臺(tái)：
 4      *         xml:
 5      *         <list>
 6      *             <city id="1">
 7      *             <pid>1</pid>
 8      *             <cname>合肥</cname>
 9      *          </city>
10      *          <city id="2">
11      *            <pid>1</pid>
12      *            <cname>蕪湖</cname>
13      *          </city>
14      *          <city id="3">
15      *            <pid>1</pid>
16      *            <cname>蚌埠</cname>
17      *          </city>
18      *          <city id="4">
19      *            <pid>1</pid>
20      *            <cname>淮北</cname>
21      *          </city>
22      *        </list>
23      */
24     @Test
25     public void test1() {//java--->xml
26         List<City> list = new ArrayList<>();
27         list.add(new City(1,1,"合肥"));
28         list.add(new City(2,1,"蕪湖"));
29         list.add(new City(3,1,"蚌埠"));
30         list.add(new City(4,1,"淮北"));
31         
32         XStream stream = new XStream(new DomDriver());//DomDriver裝配方式
33         
34         //設(shè)置id為City.class標(biāo)簽的屬性<com.qf.pojo.City id="">
35         stream.useAttributeFor(City.class, "id");
36         
37         //使用別名city代替City.class    <com.qf.pojo.City> ----> <city> 
38         stream.alias("city", City.class);
39         
40         //list轉(zhuǎn)換為xml字符串
41         String xml = stream.toXML(list);
42         
43         System.out.println("xml:
"+xml);
44     }
45     
46     /**
47      * 控制臺(tái)：com.thoughtworks.xstream.io.StreamException: Cannot create XmlPullParser
48      */
49     @Test
50     public void test2() {//xml--->java
51         List<City> list = new ArrayList<>();
52         list.add(new City(1,1,"合肥"));
53         list.add(new City(2,1,"蕪湖"));
54         list.add(new City(3,1,"蚌埠"));
55         list.add(new City(4,1,"淮北"));
56         
57         //默認(rèn)裝配方式,使用的其實(shí)是XppDriver
58         XStream stream = new XStream();
59         //會(huì)拋出異常：com.thoughtworks.xstream.io.StreamException: Cannot create XmlPullParser
60         String xml = stream.toXML(list);
61         
62         stream.processAnnotations(List.class);
63         Object fromXML = stream.fromXML(xml);
64         List city = List.class.cast(fromXML);
65         System.out.println("city:
"+city);
66     }
67     
68     /**
69      * 控制臺(tái)：
70      * city:
71      * [City [id=1, pid=1, cname=合肥], City [id=2, pid=1, cname=蕪湖], City [id=3, pid=1, cname=蚌埠], City [id=4, pid=1, cname=淮北]]
72      */
73     @Test
74     public void test3() {//xml--->java
75         List<City> list = new ArrayList<>();
76         list.add(new City(1,1,"合肥"));
77         list.add(new City(2,1,"蕪湖"));
78         list.add(new City(3,1,"蚌埠"));
79         list.add(new City(4,1,"淮北"));
80         
81         XStream stream = new XStream(new DomDriver());
82         String xml = stream.toXML(list);
83         
84         stream.processAnnotations(List.class);
85         Object fromXML = stream.fromXML(xml);
86         List city = List.class.cast(fromXML);
87         System.out.println("city:
"+city);
88     }
89 }

xpp裝配方式創(chuàng)建XStream對(duì)象解析xml經(jīng)常會(huì)出錯(cuò)：com.thoughtworks.xstream.io.StreamException: Cannot create XmlPullParser

Java轉(zhuǎn)JSON

xStream對(duì)JSON也有非常好的支持，它提供了2個(gè)模型驅(qū)動(dòng)可以完成Java對(duì)象到JSON的相互轉(zhuǎn)換

1.使用JettisonMappedXmlDriver驅(qū)動(dòng)，可以將Java對(duì)象轉(zhuǎn)換成json，也可以將json轉(zhuǎn)換為Java對(duì)象，需要添加jettison.jar

 1 package com.qf.Test;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 import org.junit.Test;
 7 
 8 import com.qf.pojo.City;
 9 import com.thoughtworks.xstream.XStream;
10 import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;
11 
12 /**
13  * 測(cè)試用JettisonMappedXmlDriver實(shí)現(xiàn)與JSON的互相轉(zhuǎn)換
14  * @author 14505
15  *
16  */
17 public class TestJson {
18     /**
19      * Java--->json
20      * 控制臺(tái)輸出：
21      *         {"list":[{"com.qf.pojo.City":[{"id":1,"pid":1,"cname":"合肥"},{"id":2,"pid":1,"cname":"蕪湖"}]}]}
22      */
23     @Test
24     public void test1() {
25         List<City> list = new ArrayList<>();
26         list.add(new City(1,1,"合肥"));
27         list.add(new City(2,1,"蕪湖"));
28         
29         XStream stream = new XStream(new JettisonMappedXmlDriver());
30         
31         stream.setMode(XStream.NO_REFERENCES);
32 
33         //list轉(zhuǎn)換為Json字符串
34         String json = stream.toXML(list);
35         
36         System.out.println(json);
37     }
38     
39     /**
40      * json--->Java
41      * 控制臺(tái)輸出：
42      *         [[City [id=1, pid=1, cname=合肥], City [id=2, pid=1, cname=蕪湖]]]
43      */
44     @Test
45     public void test2() {
46         List<City> list = new ArrayList<>();
47         list.add(new City(1,1,"合肥"));
48         list.add(new City(2,1,"蕪湖"));
49         
50         XStream stream = new XStream(new JettisonMappedXmlDriver());
51         
52         stream.setMode(XStream.NO_REFERENCES);
53 
54         //list轉(zhuǎn)換為Json字符串
55         String json = stream.toXML(list);
56         
57         Object obj = stream.fromXML(json);
58         
59         System.out.println(obj);
60     }
61 }

2.使用JsonHierarchicalStreamDriver驅(qū)動(dòng)，只能將Java對(duì)象轉(zhuǎn)換成json

  1 package com.qf.Test;
  2 
  3 import java.io.Writer;
  4 import java.util.HashMap;
  5 import java.util.Map;
  6 
  7 import org.junit.Test;
  8 
  9 import com.qf.pojo.City;
 10 import com.thoughtworks.xstream.XStream;
 11 import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
 12 import com.thoughtworks.xstream.io.json.JsonHierarchicalStreamDriver;
 13 import com.thoughtworks.xstream.io.json.JsonWriter;
 14 
 15 /**
 16  * 測(cè)試用JsonHierarchicalStreamDriver實(shí)現(xiàn)java轉(zhuǎn)換成JSON
 17  * @author 14505
 18  *
 19  */
 20 public class TestJson {
 21     /**
 22      * Java--->json
 23      * 控制臺(tái)輸出：
 24      *         JSON：{"map": [
 25      *              [
 26      *                "city1",
 27      *                {
 28      *                  "id": 1,
 29      *                  "pid": 1,
 30      *                  "cname": "合肥"
 31      *                }
 32      *              ],
 33      *              [
 34      *                "city2",
 35      *                {
 36      *                  "id": 2,
 37      *                  "pid": 1,
 38      *                  "cname": "蕪湖"
 39      *                }
 40      *              ]
 41      *            ]}
 42      *默認(rèn)會(huì)給轉(zhuǎn)換后的對(duì)象添加一個(gè)根節(jié)點(diǎn)，可以通過重寫JsonHierarchicalStreamDriver的createWriter方法進(jìn)行設(shè)置刪除額外添加的根節(jié)點(diǎn)
 43      */
 44     @Test
 45     public void test1() {
 46         City city1 = new City(1,1,"合肥");
 47         City city2 = new City(2,1,"蕪湖");
 48         Map<String, City> map = new HashMap<>();
 49         map.put("city1", city1);
 50         map.put("city2", city2);
 51         
 52         XStream xStreamJ = new XStream(new JsonHierarchicalStreamDriver());
 53 
 54         String json = xStreamJ.toXML(map);
 55         System.out.println("JSON："+ json);
 56     }
 57     
 58     /**
 59      * Java--->json
 60      * 控制臺(tái)輸出：
 61      *         {"map": [
 62      *              [
 63      *                "city1",
 64      *                {
 65      *                  "id": 1,
 66      *                  "pid": 1,
 67      *                  "cname": "合肥"
 68      *                }
 69      *              ],
 70      *              [
 71      *                "city2",
 72      *                {
 73      *                  "id": 2,
 74      *                  "pid": 1,
 75      *                  "cname": "蕪湖"
 76      *                }
 77      *              ]
 78      *            ]
 79      *        }
 80      */
 81     @Test
 82     public void test2() {
 83         City city1 = new City(1,1,"合肥");
 84         City city2 = new City(2,1,"蕪湖");
 85         Map<String, City> map = new HashMap<>();
 86         map.put("city1", city1);
 87         map.put("city2", city2);
 88         
 89         //默認(rèn)會(huì)給轉(zhuǎn)換后的json添加一個(gè)根節(jié)點(diǎn)JSON,重寫JsonHierarchicalStreamDriver的createWriter方法可以設(shè)置刪除根節(jié)點(diǎn)
 90         XStream xStreamJ = new XStream(new JsonHierarchicalStreamDriver() {
 91             @Override
 92             public HierarchicalStreamWriter createWriter(Writer out) {
 93                 return new JsonWriter(out,JsonWriter.DROP_ROOT_MODE);
 94             }
 95         });
 96 
 97         String json = xStreamJ.toXML(map);
 98         System.out.println("JSON："+ json);
 99     }
100 }

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