Spring mvc 返回json格式
一、使用maven管理jar。
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-lgpl</artifactId>
<version>1.9.6</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.9.4</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.5</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-lgpl</artifactId>
<version>1.9.6</version>
</dependency>
二、配置spring-servlet.xml:
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list > <ref bean="mappingJacksonHttpMessageConverter" /> </list> </property> </bean>
mappingJacksonHttpMessageConverter ： 用来处理json格式转换
<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
1、
如果 mappingJacksonHttpMessageConverter 可以 直接写成如下：
<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
这样默认应该是 ：
UTF-8
2、
supportedMediaTypes 的 list 里面 可以写多个value
<list> <value>apolication/json; charset=UTF-8</value> <value>text/html;charset=UTF-8</value> </list>
三、controller 配置@ResponseBody
@Controller
public class LoginController {
@RequestMapping(value="/validataUser.json")
@ResponseBody
public Map<String,Object> validataUser(@RequestParam String userName){
logger.info(" validata user : {}",userName);
Map<String,Object> map = new HashMap<String,Object>();
map.put("code", true);
return map;
}
}
四：页面上仍然按照原来的ajax区json的格式一样、
题外话：
关于 @ResponseBody：
将内容或对象作为 HTTP 响应正文返回，使用@ResponseBody将会跳过视图处理部分，而是调用适合HttpMessageConverter，将返回值写入输出流。
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spring MVC之返回JSON数据(Spring3.0 MVC)
我们在本示例中，使用Spring3.0 MVC, Spring 3.0 MVC已经支持JSON了。
这里我们使用基于注解的方式，也是springMVC 3.0所支持的RESTFul风格的。
1.首先加入两个jar依赖,这里以maven构建为例：
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.8.4</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.8.4</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.8.4</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.8.4</version>
</dependency>
这是spring MVC处理json数据时，所必须的jar依赖。
2.在spring mvc的配置文件中加入配置
这里我们使用的是spring mvc的注解，如例：
<context:component-scan base-package="com.hundsun.twioo.business.action" />
<bean class="org.springframework.web.servlet.mvc.annotation.
DefaultAnnotationHandlerMapping" />
<bean class="org.springframework.web.servlet.mvc.annotation.
AnnotationMethodHandlerAdapter" >
<property name="messageConverters">
<util:list id="beanList">
<ref bean="mappingJacksonHttpMessageConverter"/>
</util:list>
</property>
</bean>
<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.
http.converter.json.MappingJacksonHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>
<context:annotation-config/>
<context:component-scan base-package="com.hundsun.twioo.business.action" />
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" >
<property name="messageConverters">
<util:list id="beanList">
<ref bean="mappingJacksonHttpMessageConverter"/>
</util:list>
</property>
</bean>
<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>
<context:annotation-config/>
注意：org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter的Bean配置中，我们加入了messageConverters属性，在该属性中我们有配置mappingJacksonHttpMessageConverter这个Bean,它就是用来处理json数据转换的。
在mappingJacksonHttpMessageConverter的Bean配置中，我们有一个supportedMediaTypes属性，在这个属性中我们添加了text/html;charset=UTF-8这个值，它是为了处理返回的json数据的编码，默认是UTF-8，如果有乱码的情况，我们只需要修改这里就可以了。
3.控制器Controller上的注解使用
如例：
@Controller
@RequestMapping("/logins")
public class LoginController {
@Autowired
private LoginManagerService loginManagerService;
@Autowired
private PermitManagerService permitManagerService;
private Logger log = Logger.getLogger(LoginController.class);
/**
* 用户登录系统
* @return
*/
@RequestMapping(value="/login")
public ModelAndView login(HttpServletRequest request,HttpSession session){
User user = null;
List<Module> moduleList = null;
try {
//TwiooID
Integer twiooId = ServletRequestUtils.getIntParameter(request, "twiooId");
//群ID
Integer groupId = ServletRequestUtils.getIntParameter(request, "groupId");
user = loginManagerService.login(twiooId, 3);
if(null != user){
moduleList = permitManagerService.findPermit(user.getId());
}
session.setAttribute("user", user);
session.setAttribute("permit", moduleList);
session.setAttribute("twiooId", twiooId);
session.setAttribute("groupId", groupId);
} catch (Exception e) {
e.printStackTrace();
log.error("LoginController.login() execute error!!!");
}
System.out.println("login...................");
return new ModelAndView("index");
}
/**
* 用户退出系统
* @return
*/
@RequestMapping(value="/exit")
public ModelAndView exit(HttpServletRequest request,HttpSession session){
session.removeAttribute("user");
session.removeAttribute("permit");
session.removeAttribute("twiooId");
session.removeAttribute("twiooId");
System.out.println("exit....................");
return new ModelAndView("index");
}
/**
* 测试返回JSON数据
* @param session
* @return
*/
@RequestMapping(value="/test")
@ResponseBody
public Object test(HttpSession session){
System.out.println("test....................");
return session.getAttribute("permit");
}
public LoginManagerService getLoginManagerService() {
return loginManagerService;
}
public void setLoginManagerService(LoginManagerService loginManagerService) {
this.loginManagerService = loginManagerService;
}
public PermitManagerService getPermitManagerService() {
return permitManagerService;
}
public void setPermitManagerService(PermitManagerService permitManagerService) {
this.permitManagerService = permitManagerService;
}
}
@Controller
@RequestMapping("/logins")
public class LoginController {
@Autowired
private LoginManagerService loginManagerService;
@Autowired
private PermitManagerService permitManagerService;
private Logger log = Logger.getLogger(LoginController.class);
/**
* 用户登录系统
* @return
*/
@RequestMapping(value="/login")
public ModelAndView login(HttpServletRequest request,HttpSession session){
User user = null;
List<Module> moduleList = null;
try {
//TwiooID
Integer twiooId = ServletRequestUtils.getIntParameter(request, "twiooId");
//群ID
Integer groupId = ServletRequestUtils.getIntParameter(request, "groupId");
user = loginManagerService.login(twiooId, 3);
if(null != user){
moduleList = permitManagerService.findPermit(user.getId());
}
session.setAttribute("user", user);
session.setAttribute("permit", moduleList);
session.setAttribute("twiooId", twiooId);
session.setAttribute("groupId", groupId);
} catch (Exception e) {
e.printStackTrace();
log.error("LoginController.login() execute error!!!");
}
System.out.println("login...................");
return new ModelAndView("index");
}
/**
* 用户退出系统
* @return
*/
@RequestMapping(value="/exit")
public ModelAndView exit(HttpServletRequest request,HttpSession session){
session.removeAttribute("user");
session.removeAttribute("permit");
session.removeAttribute("twiooId");
session.removeAttribute("twiooId");
System.out.println("exit....................");
return new ModelAndView("index");
}
/**
* 测试返回JSON数据
* @param session
* @return
*/
@RequestMapping(value="/test")
@ResponseBody
public Object test(HttpSession session){
System.out.println("test....................");
return session.getAttribute("permit");
}
public LoginManagerService getLoginManagerService() {
return loginManagerService;
}
public void setLoginManagerService(LoginManagerService loginManagerService) {
this.loginManagerService = loginManagerService;
}
public PermitManagerService getPermitManagerService() {
return permitManagerService;
}
public void setPermitManagerService(PermitManagerService permitManagerService) {
this.permitManagerService = permitManagerService;
}
}
注意：test()方法上，我们使用了一个@ResponseBody的注解，Spring3.0 MVC @ResponseBody的作用是把返回值直接写到HTTP response body里。 test()这个方法就是我们这里关注的地方，它就是返回json数据到客户端去的。还要注意，这个test()方法返回的是Object(这里可以是任意类型)，而不ModelAndView。