一些json数据格式转换的例子
2016-07-09 13:59
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question1:后台接受到前台的json格式的字符串怎么处理?
![](http://pic002.cnblogs.com/images/2012/337983/2012040721153232.jpg)
question2:后台是怎么拼装json格式的字符串?
![](http://pic002.cnblogs.com/images/2012/337983/2012040721162255.jpg)
question3:json格式的字符串怎么转换为xml格式的字符串?
![](http://pic002.cnblogs.com/images/2012/337983/2012040721165318.jpg)
question4:xml格式的字符串怎么转换为json格式的字符串?
![](http://pic002.cnblogs.com/images/2012/337983/2012040721231871.jpg)
question5:javabean怎么转换为json字符串?
![](http://pic002.cnblogs.com/images/2012/337983/2012040721172311.jpg)
question6:javabean怎么转换为xml字符串?
![](http://pic002.cnblogs.com/images/2012/337983/2012040721175521.jpg)
完整的JSONObject_1_3.java代码如下:
完整的UserInfo.java代码如下:
第三种方式是使用ContentNegotiatingViewResolver来设置输出为json格式,需要修改servlet context配置文件如下
<bean
class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="order" value="1" />
<property name="mediaTypes">
<map>
<entry key="json" value="application/json" />
</map>
</property>
<property name="defaultViews">
<list>
<bean
class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />
</list>
</property>
<property name="ignoreAcceptHeader" value="true" />
</bean>但这种格式的输出会返回{model类名:{内容}} 的json格式, 例如,以下代码
修改方法,重载MappingJacksonJsonView类并重写filterModel方法如下
protected Object filterModel(Map<String, Object> model) {
Map<?, ?> result = (Map<?, ?>) super.filterModel(model);
if (result.size() == 1) {
return result.values().iterator().next();
} else {
return result;
}
}对应的ContentNegotiatingViewResolver修改如下
<bean
class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="order" value="1" />
<property name="mediaTypes">
<map>
<entry key="json" value="application/json" />
</map>
</property>
<property name="defaultViews">
<list>
<bean
class="net.zhepu.json.MappingJacksonJsonView" />
</list>
</property>
<property name="ignoreAcceptHeader" value="true" />
</bean>
note.txt是报的对应的错误及解决方法,也从另一个方面说明为什么需要导入前面提到的jar包;
note.txt文件内容如下:
java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at generate.TestJSONObject.main(TestJSONObject.java:40)
Exception in thread "main"
解决方案:导入commons-lang-2.1.jar
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at net.sf.json.JSONObject.<clinit>(JSONObject.java:125)
at generate.TestJSONObject.main(TestJSONObject.java:40)
Exception in thread "main"
解决方案:导入commons-logging.jar
java.lang.NoClassDefFoundError: org/apache/commons/beanutils/DynaBean
at net.sf.json.JSONObject.set(JSONObject.java:2164)
at net.sf.json.JSONObject.put(JSONObject.java:1853)
at net.sf.json.JSONObject.put(JSONObject.java:1806)
at generate.TestJSONObject.main(TestJSONObject.java:41)
Exception in thread "main"
解决方案:导入commons-beanutils.jar
java.lang.NoClassDefFoundError: net/sf/ezmorph/MorpherRegistry
at net.sf.json.util.JSONUtils.<clinit>(JSONUtils.java:65)
at net.sf.json.JSONObject.set(JSONObject.java:2164)
at net.sf.json.JSONObject.put(JSONObject.java:1853)
at net.sf.json.JSONObject.put(JSONObject.java:1806)
at generate.TestJSONObject.main(TestJSONObject.java:41)
Exception in thread "main"
解决方案:导入ezmorph-1.0.2.jar
java.lang.NoClassDefFoundError: org/apache/commons/collections/FastHashMap
at org.apache.commons.beanutils.PropertyUtils.<clinit>(PropertyUtils.java:208)
at net.sf.json.JSONObject.fromBean(JSONObject.java:190)
at net.sf.json.JSONObject.fromObject(JSONObject.java:437)
at net.sf.json.JSONObject.set(JSONObject.java:2196)
at net.sf.json.JSONObject.put(JSONObject.java:1853)
at net.sf.json.JSONObject.put(JSONObject.java:1806)
at generate.TestJSONObject.main(TestJSONObject.java:41)
Exception in thread "main"
解决方案:导入commons-collections-3.0.jar
Exception in thread "main" java.lang.NoClassDefFoundError: nu/xom/Serializer
at generate.TestJSONObject.jsonToXML(TestJSONObject.java:88)
at generate.TestJSONObject.main(TestJSONObject.java:96)
解决方案:导入xom-1.0d10.jar
几点说明:
1.注意UserInfo类的修饰符,用public修饰,变量username和password也用public修饰,最好单独的写一个类,这里就不贴出来了
2.以上json字符串和xml字符串都是最简单的形式,实际开发中json字符串和xml格式比这个复杂的多,
处理复杂的json字符串,可以封装写一个类继承HashMap,然后重写其put和get方法,以支持对类型为A[0].B及A.B的键值的读取和指定
3.以上6中情况在实际开发中可能有些不存在或不常用
存在的问题:
1.使用XMLSerializer的write方法生成的xml字符串的中文乱码问题
2.question4中的红色的log日志问题
2012-4-6 15:04:35 net.sf.json.xml.XMLSerializer getType
信息: Using default type string
$(".MathJax").remove();
public static void jsonToJAVA() { System.out.println("json字符串转java代码"); String jsonStr = "{\"password\":\"123456\",\"username\":\"张三\"}"; JSONObject jsonObj = JSONObject.fromString(jsonStr); String username = jsonObj.getString("username"); String password = jsonObj.optString("password"); System.out.println("json--->java\n username=" + username + "\t password=" + password); }
![](http://pic002.cnblogs.com/images/2012/337983/2012040721153232.jpg)
question2:后台是怎么拼装json格式的字符串?
public static void javaToJSON() { System.out.println("java代码封装为json字符串"); JSONObject jsonObj = new JSONObject(); jsonObj.put("username", "张三"); jsonObj.put("password", "123456"); System.out.println("java--->json \n" + jsonObj.toString()); }
![](http://pic002.cnblogs.com/images/2012/337983/2012040721162255.jpg)
question3:json格式的字符串怎么转换为xml格式的字符串?
public static void jsonToXML() { System.out.println("json字符串转xml字符串"); String jsonStr = "{\"password\":\"123456\",\"username\":\"张三\"}"; JSONObject json = JSONObject.fromString(jsonStr); XMLSerializer xmlSerializer = new XMLSerializer(); xmlSerializer.setRootName("user_info"); xmlSerializer.setTypeHintsEnabled(false); String xml = xmlSerializer.write(json); System.out.println("json--->xml \n" + xml); }
![](http://pic002.cnblogs.com/images/2012/337983/2012040721165318.jpg)
question4:xml格式的字符串怎么转换为json格式的字符串?
public static void xmlToJSON(){ System.out.println("xml字符串转json字符串"); String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><user_info><password>123456</password><username>张三</username></user_info>"; JSON json=XMLSerializer.read(xml); System.out.println("xml--->json \n"+json.toString()); }
![](http://pic002.cnblogs.com/images/2012/337983/2012040721231871.jpg)
question5:javabean怎么转换为json字符串?
public static void javaBeanToJSON() { System.out.println("javabean转json字符串"); UserInfo userInfo = new UserInfo(); userInfo.setUsername("张三"); userInfo.setPassword("123456"); JSONObject json = JSONObject.fromBean(userInfo); System.out.println("javabean--->json \n" + json.toString()); }
![](http://pic002.cnblogs.com/images/2012/337983/2012040721172311.jpg)
question6:javabean怎么转换为xml字符串?
public static void javaBeanToXML() { System.out.println("javabean转xml字符串"); UserInfo userInfo = new UserInfo(); userInfo.setUsername("张三"); userInfo.setPassword("123456"); JSONObject json = JSONObject.fromBean(userInfo); XMLSerializer xmlSerializer = new XMLSerializer(); String xml = xmlSerializer.write(json, "UTF-8"); System.out.println("javabean--->xml \n" + xml); }
![](http://pic002.cnblogs.com/images/2012/337983/2012040721175521.jpg)
完整的JSONObject_1_3.java代码如下:
JSONObject_1_3
package json;
import net.sf.json.JSON;
import net.sf.json.JSONObject;
import net.sf.json.xml.XMLSerializer;
public class JSONObject_1_3 {
public static void javaToJSON() { System.out.println("java代码封装为json字符串"); JSONObject jsonObj = new JSONObject(); jsonObj.put("username", "张三"); jsonObj.put("password", "123456"); System.out.println("java--->json \n" + jsonObj.toString()); }
public static void jsonToJAVA() { System.out.println("json字符串转java代码"); String jsonStr = "{\"password\":\"123456\",\"username\":\"张三\"}"; JSONObject jsonObj = JSONObject.fromString(jsonStr); String username = jsonObj.getString("username"); String password = jsonObj.optString("password"); System.out.println("json--->java\n username=" + username + "\t password=" + password); }
public static void jsonToXML() { System.out.println("json字符串转xml字符串"); String jsonStr = "{\"password\":\"123456\",\"username\":\"张三\"}"; JSONObject json = JSONObject.fromString(jsonStr); XMLSerializer xmlSerializer = new XMLSerializer(); xmlSerializer.setRootName("user_info"); xmlSerializer.setTypeHintsEnabled(false); String xml = xmlSerializer.write(json); System.out.println("json--->xml \n" + xml); }
public static void javaBeanToJSON() { System.out.println("javabean转json字符串"); UserInfo userInfo = new UserInfo(); userInfo.setUsername("张三"); userInfo.setPassword("123456"); JSONObject json = JSONObject.fromBean(userInfo); System.out.println("javabean--->json \n" + json.toString()); }
public static void javaBeanToXML() { System.out.println("javabean转xml字符串"); UserInfo userInfo = new UserInfo(); userInfo.setUsername("张三"); userInfo.setPassword("123456"); JSONObject json = JSONObject.fromBean(userInfo); XMLSerializer xmlSerializer = new XMLSerializer(); String xml = xmlSerializer.write(json, "UTF-8"); System.out.println("javabean--->xml \n" + xml); }
public static void xmlToJSON(){ System.out.println("xml字符串转json字符串"); String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><user_info><password>123456</password><username>张三</username></user_info>"; JSON json=XMLSerializer.read(xml); System.out.println("xml--->json \n"+json.toString()); }
public static void main(String args[]) {
// javaToJSON();
// jsonToJAVA();
// jsonToXML();
// javaBeanToJSON();
// javaBeanToXML();
xmlToJSON();
}
}
完整的UserInfo.java代码如下:
UserInfo package json; public class UserInfo { public String username; public String password; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }
第三种方式是使用ContentNegotiatingViewResolver来设置输出为json格式,需要修改servlet context配置文件如下
<bean
class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="order" value="1" />
<property name="mediaTypes">
<map>
<entry key="json" value="application/json" />
</map>
</property>
<property name="defaultViews">
<list>
<bean
class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />
</list>
</property>
<property name="ignoreAcceptHeader" value="true" />
</bean>但这种格式的输出会返回{model类名:{内容}} 的json格式, 例如,以下代码
@RequestMapping("/json3.json") public JsonResult testJson3(@RequestBody User u){ log.info("handle json output from ContentNegotiatingViewResolver"); return new JsonResult(true,"return ok"); }期望的返回是 {success:true,message:”return ok”}; 但实际返回的却是 {"jsonResult":{"success":true,"msg":"return ok"}} 原因是MappingJacksonJsonView中对返回值的处理未考虑modelMap中只有一个值的情况,直接是按照mapName:{mapResult}的格式来返回数据的。
修改方法,重载MappingJacksonJsonView类并重写filterModel方法如下
protected Object filterModel(Map<String, Object> model) {
Map<?, ?> result = (Map<?, ?>) super.filterModel(model);
if (result.size() == 1) {
return result.values().iterator().next();
} else {
return result;
}
}对应的ContentNegotiatingViewResolver修改如下
<bean
class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="order" value="1" />
<property name="mediaTypes">
<map>
<entry key="json" value="application/json" />
</map>
</property>
<property name="defaultViews">
<list>
<bean
class="net.zhepu.json.MappingJacksonJsonView" />
</list>
</property>
<property name="ignoreAcceptHeader" value="true" />
</bean>
result
代码和运行结果都已经贴在每个问题的后面,运行时直接用main方法分别对每个方法运行即可看到测试效果。note.txt是报的对应的错误及解决方法,也从另一个方面说明为什么需要导入前面提到的jar包;
note.txt文件内容如下:
java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at generate.TestJSONObject.main(TestJSONObject.java:40)
Exception in thread "main"
解决方案:导入commons-lang-2.1.jar
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at net.sf.json.JSONObject.<clinit>(JSONObject.java:125)
at generate.TestJSONObject.main(TestJSONObject.java:40)
Exception in thread "main"
解决方案:导入commons-logging.jar
java.lang.NoClassDefFoundError: org/apache/commons/beanutils/DynaBean
at net.sf.json.JSONObject.set(JSONObject.java:2164)
at net.sf.json.JSONObject.put(JSONObject.java:1853)
at net.sf.json.JSONObject.put(JSONObject.java:1806)
at generate.TestJSONObject.main(TestJSONObject.java:41)
Exception in thread "main"
解决方案:导入commons-beanutils.jar
java.lang.NoClassDefFoundError: net/sf/ezmorph/MorpherRegistry
at net.sf.json.util.JSONUtils.<clinit>(JSONUtils.java:65)
at net.sf.json.JSONObject.set(JSONObject.java:2164)
at net.sf.json.JSONObject.put(JSONObject.java:1853)
at net.sf.json.JSONObject.put(JSONObject.java:1806)
at generate.TestJSONObject.main(TestJSONObject.java:41)
Exception in thread "main"
解决方案:导入ezmorph-1.0.2.jar
java.lang.NoClassDefFoundError: org/apache/commons/collections/FastHashMap
at org.apache.commons.beanutils.PropertyUtils.<clinit>(PropertyUtils.java:208)
at net.sf.json.JSONObject.fromBean(JSONObject.java:190)
at net.sf.json.JSONObject.fromObject(JSONObject.java:437)
at net.sf.json.JSONObject.set(JSONObject.java:2196)
at net.sf.json.JSONObject.put(JSONObject.java:1853)
at net.sf.json.JSONObject.put(JSONObject.java:1806)
at generate.TestJSONObject.main(TestJSONObject.java:41)
Exception in thread "main"
解决方案:导入commons-collections-3.0.jar
Exception in thread "main" java.lang.NoClassDefFoundError: nu/xom/Serializer
at generate.TestJSONObject.jsonToXML(TestJSONObject.java:88)
at generate.TestJSONObject.main(TestJSONObject.java:96)
解决方案:导入xom-1.0d10.jar
几点说明:
1.注意UserInfo类的修饰符,用public修饰,变量username和password也用public修饰,最好单独的写一个类,这里就不贴出来了
2.以上json字符串和xml字符串都是最简单的形式,实际开发中json字符串和xml格式比这个复杂的多,
处理复杂的json字符串,可以封装写一个类继承HashMap,然后重写其put和get方法,以支持对类型为A[0].B及A.B的键值的读取和指定
3.以上6中情况在实际开发中可能有些不存在或不常用
存在的问题:
1.使用XMLSerializer的write方法生成的xml字符串的中文乱码问题
2.question4中的红色的log日志问题
2012-4-6 15:04:35 net.sf.json.xml.XMLSerializer getType
信息: Using default type string
$(".MathJax").remove();
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