深入解析 Spring MVC的配置文件
1.关于mvc annotation-driven 中出入参数和消息转换配置
<mvc:annotation-driven message-codes-resolver ="bean ref" validator="" conversion-service=""> <mvc:return-value-handlers> <bean></bean> </mvc:return-value-handlers> <mvc:argument-resolvers> </mvc:argument-resolvers> <mvc:message-converters> </mvc:message-converters>[/color] </mvc:annotation-driven>
说明：
return-value-handlers --- 请求方法的返回值(出参)处理 ----- HandlerMethodReturnValueHandler
argument-resolvers --- 请求方法的入参处理 ----- HandlerMethodArgumentResolver 或 WebArgumentResolver
message-converters --- 消息转换处理 ----- HttpMessageConverter
2.自定义各个属性演示
1、return-value-handlers
允许注册实现了HandlerMethodReturnValueHandler接口的bean，来对handler method的特定的返回类型做处理
HandlerMethodReturnValueHandler接口中定义了两个方法
supportsReturnType 方法用来确定此实现类是否支持对应返回类型。
handleReturnValue 则用来处理具体的返回类型
例如以下的handlerMethod
@RequestMapping("/testReturnHandlers")
public User testHandlerReturnMethod(){
User u = new User();
u.setUserName("test");
return u;
}
所返回的类型为一个pojo，正常情况下spring mvc无法解析，将转由DefaultRequestToViewNameTranslator 解析出一个缺省的view name，转到 testReturnHandlers.jsp
我们增加以下配置
<mvc:annotation-driven validator="validator">
<mvc:return-value-handlers>
<bean class="net.zhepu.web.handlers.returnHandler.UserHandlers"></bean>
</mvc:return-value-handlers>
</mvc:annotation-driven>
实现类
public class UserHandlers implements HandlerMethodReturnValueHandler {
Logger logger = LoggerFactory.getLogger(this.getClass());
@Override
public boolean supportsReturnType(MethodParameter returnType) {
Class<?> type = returnType.getParameterType();
if(User.class.equals(type))
{
return true;
}
return false;
}
@Override
public void handleReturnValue(Object returnValue,
MethodParameter returnType, ModelAndViewContainer mavContainer,
NativeWebRequest webRequest) throws Exception {
logger.info("handler for return type users ");
mavContainer.setViewName("helloworld");
}
}
此时再访问 http://localhost:8080/springmvc/testReturnHandlers ，将交由 UserHandlers来处理返回类型为User的返回值
2、argument-resolvers
允许注册实现了WebArgumentResolver接口的bean，来对handlerMethod中的用户自定义的参数或annotation进行解析
<mvc:annotation-driven validator="validator">
<mvc:argument-resolvers>
<bean class="net.zhepu.web.handlers.argumentHandler.MyCustomerWebArgumentHandler" />
</mvc:argument-resolvers>
</mvc:annotation-driven>
java代码如下
public class MyCustomerWebArgumentHandler implements WebArgumentResolver {
@Override
public Object resolveArgument(MethodParameter methodParameter,
NativeWebRequest webRequest) throws Exception {
if (methodParameter.getParameterType().equals(MyArgument.class)) {
MyArgument argu = new MyArgument();
argu.setArgumentName("winzip");
argu.setArgumentValue("123456");
return argu;
}
return UNRESOLVED;
}
}
这里我们定义了一个 customer webArgumentHandler，当handler method中参数类型为 MyArgument时生成对参数的类型绑定操作
注意新注册的webArgumentHandler的优先级最低，即如果系统缺省注册的ArgumentHandler已经可以解析对应的参数类型时，就不会再调用到新注册的customer ArgumentHandler了
message-converters
允许注册实现了HttpMessageConverter接口的bean，来对requestbody 或responsebody中的数据进行解析
例如
假设我们使用text/plain格式发送一串字符串来表示User对象，各个属性值使用”|”来分隔。
例如 winzip|123456|13818888888，期望转为user对象，各属性内容为user.username = winzip,user.password=123456;user.mobileNO = 13818888888
以下代码中supports表示此httpmessageConverter实现类针对User类进行解析。
构造函数中调用super(new MediaType("text", "plain"));以表示支持 text/plain格式的输入
public class MyCustomerMessageConverter extends AbstractHttpMessageConverter<Object> {
@Override
protected boolean supports(Class<?> clazz) {
if (clazz.equals(User.class)) {
return true;
}
return false;
}
public MyCustomerMessageConverter() {
super(new MediaType("text", "plain"));
}
@Override
protected Object readInternal(Class<? extends Object> clazz,
HttpInputMessage inputMessage) throws IOException,
HttpMessageNotReadableException {
Charset charset;
MediaType contentType = inputMessage.getHeaders().getContentType();
if (contentType != null && contentType.getCharSet() != null) {
charset = contentType.getCharSet();
} else {
charset = Charset.forName("UTF-8");
}
String input = FileCopyUtils.copyToString(new InputStreamReader(
inputMessage.getBody(), charset));
logger.info(input);
String[] s = input.split("\\|");
User u = new User();
u.setUserName(s[0]);
u.setPassword(s[1]);
u.setMobileNO(s[2]);
return u;
}
@Override
protected void writeInternal(Object t, HttpOutputMessage outputMessage)
throws IOException, HttpMessageNotWritableException {
}
}
修改servlet context xml配置文件，增加message-converters的相应配置如下
<mvc:message-converters>
<bean class="net.zhepu.web.handlers.messageConverterHandler.MyCustomerMessageConverter"></bean>
</mvc:message-converters>
3、message-codes-resolver
先看看spring mvc中对于messageCodeResolver的用法
spring mvc中使用DefaultMessageCodesResolver作为缺省的MessageCodesResolver的实现类，
其作用是对valid errors中的errorcode进行解析。其解析方式如下
当解析error global object注册的errorcode时，errorcode的查找顺序为
1：errorcode.validationobjectname
2：errorcode
例如以下声明中
public String helloWorld2(@ModelAttribute("user") User u,BindingResult result)
当使用 result.reject("testFlag");来注册一个globat error object时，spring mvc将在messageSource中先查找 testFlag.user这个errorcode,当找不到时再查找testFlag这个errorcode。
当解析fields error时，将按以下顺序生成error code
1.: code + "." + object name + "." + field
2.: code + "." + field
3.: code + "." + field type
4.: code
还是以上面的代码为例，当使用 result.rejectValue("userName", "testFlag");来注册一个针对user.UserName属性的错误描述时，errors对象中将生成以下的error code list,
1.: testFlag.user.userName
2.: testFlag.userName
3.: testFlag.java.lang.String
4.: testFlag
而mvc:annotation-driven新增的属性message-codes-resolver则提供了注册自定义的MessageCodesResolver的手段。
例如上面想要在所有的error code前增加前缀validation.的话，可以这么来做
<mvc:annotation-driven validator="validator" message-codes-resolver="messageCodeResolver">
</mvc:annotation-driven>
新增messageCodeResolver bean定义如下
<bean id="messageCodeResolver" class="org.springframework.validation.DefaultMessageCodesResolver">
<property name="prefix" value="validation."></property>
</bean>
此时，所有的errorcode都会生成缺省前缀 validation.
例如前面的 result.reject("testFlag"); 生成的error code list就变为了
validation.testFlag.user 和 validation.testFlag了
@RequestMapping 新增参数Consumes 和Produces
@RequestMapping的参数中有一个header的参数，来指定handler method能接受的http request 请求的header内容
而consumes和produces则更进一步，直接指定所能接受或产生的request请求的content type
@RequestMapping(value="/testMsgConverter",consumes="text/plain",produces="application/json")
表示handlermethod接受的请求的header中的 Content-Type为text/plain;
Accept为application/json
URI Template 新增功能
@PathVariable 声明的参数可自动加入到model中
例如
@RequestMapping("/develop/apps/edit/{slug}")
public String editForm(@PathVariable String slug, Model model) {
model.addAttribute("slug", slug);
// ...
}
现在可以写为
@RequestMapping("/develop/apps/edit/{slug}")
public String editForm(@PathVariable String slug, Model model) {
// model contains "slug" variable
}
handler method中的redirect string可支持url template了
@RequestMapping(
value="/groups/{group}/events/{year}/{month}/{slug}/rooms",
method=RequestMethod.POST)
public String createRoom(
@PathVariable String group, @PathVariable Integer year,
@PathVariable Integer month, @PathVariable String slug) {
// ...
return "redirect:/groups/" + group + "/events/" + year + "/" + month + "/" + slug;
}
现在可写为
@RequestMapping(
value="/groups/{group}/events/{year}/{month}/{slug}/rooms",
method=RequestMethod.POST)
public String createRoom(
@PathVariable String group, @PathVariable Integer year,
@PathVariable Integer month, @PathVariable String slug) {
// ...
return "redirect:/groups/{group}/events/{year}/{month}/{slug}";
}
url template中可支持databinding 了
@RequestMapping("/people/{firstName}/{lastName}/SSN")
public String find(Person person,
@PathVariable String firstName,
@PathVariable String lastName) {
person.setFirstName(firstName);
person.setLastName(lastName);
// ...
}
现在可以写成
@RequestMapping("/people/{firstName}/{lastName}/SSN")
public String search(Person person) {
// person.getFirstName() and person.getLastName() are populated
// ...
}
Validation For @RequestBody
@RequestBody现在直接支持@valid标注了,如果validation失败，将抛出RequestBodyNotValidException
具体处理逻辑可见 spring 中的RequestResponseBodyMethodProcessor中的以下代码
public Object resolveArgument(MethodParameter parameter,
ModelAndViewContainer mavContainer,
NativeWebRequest webRequest,
WebDataBinderFactory binderFactory) throws Exception {
Object arg = readWithMessageConverters(webRequest, parameter, parameter.getParameterType());
if (shouldValidate(parameter, arg)) {
String argName = Conventions.getVariableNameForParameter(parameter);
WebDataBinder binder = binderFactory.createBinder(webRequest, arg, argName);
binder.validate();
Errors errors = binder.getBindingResult();
if (errors.hasErrors()) {
throw new RequestBodyNotValidException(errors);
}
}
return arg;
}
3.配置演示 mvc:annotation-driven默认都干了点神马？？？
里面的默认值，都可以通过实现接口或继承的方式，自定义替换
<!-- 配置路径扩展名映射的媒体类型 -->
<bean name="pathExtensionContentNegotiationStrategy"
class="org.springframework.web.accept.PathExtensionContentNegotiationStrategy">
<constructor-arg>
<props>
<!-- if romePresent -->
<prop key="atom">application/atom+xml</prop>
<prop key="rss">application/rss+xml</prop>
<!-- endif -->
<!-- if jackson2Present || jacksonPresent -->
<prop key="json">application/json</prop>
<!-- endif -->
<!-- if jaxb2Present -->
<prop key="xml">application/xml</prop>
<!-- endif -->
</props>
</constructor-arg>
</bean>
<!-- 配置映射媒体类型的策略 -->
<bean name="mvcContentNegotiationManager"
class="org.springframework.web.accept.ContentNegotiationManager">
<constructor-arg>
<list>
<ref bean="pathExtensionContentNegotiationStrategy" />
</list>
</constructor-arg>
</bean>
<!-- 配置方法级别的@RequestMapping处理器 -->
<bean name="requestMappingHandlerMapping"
class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping">
<property name="order" value="0" />
<property name="contentNegotiationManager" ref="mvcContentNegotiationManager" />
</bean>
<!-- 配置数据转换服务，默认使用格式化数据转换服务，可以对日期和数字进行格式化 -->
<bean name="conversionService"
class="org.springframework.format.support.DefaultFormattingConversionService">
<constructor-arg index="0">
<null></null>
</constructor-arg>
<constructor-arg index="1">
<value>true</value>
</constructor-arg>
</bean>
<bean name="validator"
class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"></bean>
<!-- 配置数据绑定，通过转换服务实现绑定，如果包含jsr303实现还将进行校验 -->
<bean name="webBindingInitializer"
class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
<property name="conversionService" ref="conversionService" />
<!-- if jsr303Present -->
<property name="validator" ref="validator" />
<!-- endif -->
</bean>
<bean name="byteArrayHttpMessageConverter"
class="org.springframework.http.converter.ByteArrayHttpMessageConverter"></bean>
<bean name="stringHttpMessageConverter"
class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="writeAcceptCharset" value="false" />
</bean>
<bean name="resourceHttpMessageConverter"
class="org.springframework.http.converter.ResourceHttpMessageConverter"></bean>
<bean name="sourceHttpMessageConverter"
class="org.springframework.http.converter.xml.SourceHttpMessageConverter"></bean>
<bean name="allEncompassingFormHttpMessageConverter"
class="org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter"></bean>
<bean name="atomFeedHttpMessageConverter"
class="org.springframework.http.converter.feed.AtomFeedHttpMessageConverter"></bean>
<bean name="rssChannelHttpMessageConverter"
class="org.springframework.http.converter.feed.RssChannelHttpMessageConverter"></bean>
<bean name="jaxb2RootElementHttpMessageConverter"
class="org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter"></bean>
<bean name="mappingJackson2HttpMessageConverter"
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean>
<bean name="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean>
<!-- 配置@RequestBody，@ResponseBody注解可用的转换器 -->
<util:list id="messageConverters"
list-class="org.springframework.beans.factory.support.ManagedList.ManagedList">
<ref bean="byteArrayHttpMessageConverter" />
<ref bean="stringHttpMessageConverter" />
<ref bean="resourceHttpMessageConverter" />
<ref bean="sourceHttpMessageConverter" />
<ref bean="allEncompassingFormHttpMessageConverter" />
<!-- if romePresent -->
<ref bean="atomFeedHttpMessageConverter" />
<ref bean="rssChannelHttpMessageConverter" />
<!-- endif -->
<!-- if jaxb2Present -->
<ref bean="jaxb2RootElementHttpMessageConverter" />
<!-- endif -->
<!-- if jackson2Present -->
<ref bean="mappingJackson2HttpMessageConverter" />
<!-- endif -->
<!-- if jacksonPresent -->
<ref bean="mappingJacksonHttpMessageConverter" />
<!-- endif -->
</util:list>
<!-- 将任意类型的Controller适配为Handler -->
<bean name="requestMappingHandlerAdapter"
class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="contentNegotiationManager" ref="mvcContentNegotiationManager" />
<property name="webBindingInitializer" ref="webBindingInitializer" />
<property name="messageConverters" ref="messageConverters" />
</bean>
<!-- 这个拦截器暴露转换器服务让spring:bind和spring:eval标签可用 -->
<bean name="csInterceptor"
class="org.springframework.web.servlet.handler.ConversionServiceExposingInterceptor">
<constructor-arg index="0">
<ref bean="conversionService" />
</constructor-arg>
</bean>
<!-- 现在所有拦截器都必须设定响应的路径映射 -->
<bean name="mappedCsInterceptor"
class="org.springframework.web.servlet.handler.MappedInterceptor">
<constructor-arg index="0">
<null></null>
</constructor-arg>
<constructor-arg index="1">
<ref bean="csInterceptor" />
</constructor-arg>
</bean>
<!-- 使用@ExceptionHandler注解的方法来处理Exception，优先级为0（最高） -->
<bean name="exceptionHandlerExceptionResolver"
class="org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver">
<property name="contentNegotiationManager" ref="mvcContentNegotiationManager" />
<property name="messageConverters" ref="messageConverters" />
<property name="order" value="0" />
</bean>
<!-- 如果抛出的Exception类带有@ResponseStatus注解，响应返回该注解的Http状态码，优先级为1 -->
<bean name="responseStatusExceptionResolver"
class="org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver">
<property name="order" value="1" />
</bean>
<!-- SpringMvc内部异常处理 -->
<bean name="defaultExceptionResolver"
class="org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver">
<property name="order" value="2" />
</bean>
4.mvc:annotation-driven的日期处理
<mvc:annotation-driven />就是
A。注册了
一个RequestMappingHandlerMapping,
一个RequestMappingHandlerAdapter
和一个ExceptionHandlerExceptionResolver
(其中包括)支持使用注解标注在Controller方法的处理请求,例如@RequestMapping ,@ExceptionHandler等等
B。它还执行以下操作：
1. Spring 3 style type conversion through a ConversionService instance in addition to the JavaBeans PropertyEditors used for Data Binding.
2. Support for formatting Number fields using the @NumberFormat annotation through the ConversionService.
3. Support for formatting Date, Calendar, Long, and Joda Time fields using the @DateTimeFormat annotation.
4. Support for validating @Controller inputs with @Valid, if a JSR-303 Provider is present on the classpath.
5. HttpMessageConverter support for @RequestBody method parameters and @ResponseBody method return values from @RequestMapping or @ExceptionHandler methods.
C。Details for B5
This is the complete list of HttpMessageConverters set up by mvc:annotation-driven :
• ByteArrayHttpMessageConverter converts byte arrays.
• StringHttpMessageConverter converts strings.
• ResourceHttpMessageConverter converts to/from org.springframework.core.io.Resource for all media types.
• SourceHttpMessageConverter converts to/from a javax.xml.transform.Source.
• FormHttpMessageConverter converts form data to/from a MultiValueMap<String,String>.
• Jaxb2RootElementHttpMessageConverter converts Java objects to/from XML — added if JAXB2 is present on the classpath.
• MappingJackson2HttpMessageConverter (or MappingJacksonHttpMessageConverter) converts to/from JSON — added if Jackson 2 (or Jackson) is present on the classpath.
• AtomFeedHttpMessageConverter converts Atom feeds — added if Rome is present on the classpath.
• RssChannelHttpMessageConverter converts RSS feeds — added if Rome is present on the classpath.
A。注册了
一个RequestMappingHandlerMapping,
一个RequestMappingHandlerAdapter
和一个ExceptionHandlerExceptionResolver
(其中包括)支持使用注解标注在Controller方法的处理请求,例如@RequestMapping ,@ExceptionHandler等等
B。它还执行以下操作：
1. Spring 3 style type conversion through a ConversionService instance in addition to the JavaBeans PropertyEditors used for Data Binding.
2. Support for formatting Number fields using the @NumberFormat annotation through the ConversionService.
3. Support for formatting Date, Calendar, Long, and Joda Time fields using the @DateTimeFormat annotation.
4. Support for validating @Controller inputs with @Valid, if a JSR-303 Provider is present on the classpath.
5. HttpMessageConverter support for @RequestBody method parameters and @ResponseBody method return values from @RequestMapping or @ExceptionHandler methods.
C。Details for B5
This is the complete list of HttpMessageConverters set up by mvc:annotation-driven :
• ByteArrayHttpMessageConverter converts byte arrays.
• StringHttpMessageConverter converts strings.
• ResourceHttpMessageConverter converts to/from org.springframework.core.io.Resource for all media types.
• SourceHttpMessageConverter converts to/from a javax.xml.transform.Source.
• FormHttpMessageConverter converts form data to/from a MultiValueMap<String,String>.
• Jaxb2RootElementHttpMessageConverter converts Java objects to/from XML — added if JAXB2 is present on the classpath.
• MappingJackson2HttpMessageConverter (or MappingJacksonHttpMessageConverter) converts to/from JSON — added if Jackson 2 (or Jackson) is present on the classpath.
• AtomFeedHttpMessageConverter converts Atom feeds — added if Rome is present on the classpath.
• RssChannelHttpMessageConverter converts RSS feeds — added if Rome is present on the classpath.
其实相信在大多数实际应用环境中使用mvc:annotation-driven是少数,因为一般都满足不了需求,但想快速搭配环境还是比较适合的.当使用java config,记得有文章介绍不推荐配置RequestMappingHandlerMapping和RequestMappingHandlerAdapter
如果不使用mvc:annotation-driven,日期又如何处理.
--- 使用@DateTime(patter="yyyy-MM-dd HH:mm:ss") ，在Controller方法参数或Vo属性中添加该注解，需要joda-time包
--- 使用序列化和反序列化方式实现，自定义序列化和反序列化解析类，通过注解实现
@JsonSerialize(using = DateJsonSerializer.class)
@JsonDeserialize(using = DateJsonDeserializer.class)
private Date createTime;
spring mvc默认是支持yyyy-MM-dd格式的字符串转换为java的java.util.Date.包括spring mvc框架本身和spring mvc支持的jackson.
对于其它格式的日期的字符串与Java的Date对象相互转化,一样可分为两种情况:
A:一种普通请求,前台的日期字符串与后台的Java Date对象转化,此情况,应使用spring mvc本身的内置日期处理.
B:另一种将参数写进请求体里面,使用application/json这样的mediaType发请求,对于此情况,应使用Jackson的序列化和反序列化来处理.
一.第1种情况(不要忘了加joda-time包哦):
1.先使用@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")在Controller的方法参数或VO的属性使用.
2.如果不使用mvc:annotation-driven,那么使用数据绑定来处理@DateTimeFormat这样的注解.配置例子如下:
- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />
- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
- <property name="webBindingInitializer">
- <bean class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
- <property name="conversionService" ref="conversionService" />
- </bean>
- </property>
- <property name="messageConverters">
- <list>
- <bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter"/>
- <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
- <property name="supportedMediaTypes">
- <list>
- <value>application/json; charset=UTF-8</value>
- <value>text/html; charset=UTF-8</value>
- </list>
- </property>
- </bean>
- </list>
- </property>
- </bean>
- <bean id="conversionService" class="org.springframework.format.support.DefaultFormattingConversionService"/>
1.继承定义序列化和反序列化类.例子:
- public class DateJsonSerializer extends JsonSerializer<Date> {
- public static final SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
- @Override
- public void serialize(Date date, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
- jsonGenerator.writeString(format.format(date));
- }
- }
- public class DateJsonDeserializer extends JsonDeserializer<Date> {
- public static final SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
- @Override
- public Date deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
- try {
- return format.parse(jsonParser.getText());
- } catch (ParseException e) {
- throw new RuntimeException(e);
- }
- }
- }
@JsonSerialize(using = DateJsonSerializer.class)
@JsonDeserialize(using = DateJsonDeserializer.class)
5.Spring MVC中配置，支持json和jsonp
场景:方便使用spring mvc生成json,并且兼容ie,chrome....
设计:手工指定RequestMappingHandlerMapping和RequestMappingHandlerAdapter,并给RequestMappingHandlerAdapter的messageConverters的注入属性值.不使用驱动注解(<mvc:annotation-driven />)自动配置的原因是:自动配置我没找到方法来修改response的Content-Type, 而自动配置默认的content-type是application/json;charset=UTF-8.这个contentType在谷歌浏览器很正常解析,而到了IE解析为弹出下载了,IE10,IE11一样不给面子!!!如果将contentType改为:text/html;charset=UTF-8.那IE和google浏览器都能正常解析了.
不用再去写<mvc:annotation-driven />,至于<mvc:annotation-driven />在背后做了什么,可看参考手册.注意spring版本哦,这两类从3.1才开始有的.
基于xml配置:
- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />
- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
- <property name="messageConverters">
- <list>
- <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
- <property name="supportedMediaTypes">
- <list>
- <value>text/html;charset=UTF-8</value>
- <value>application/json;charset=UTF-8</value>
- </list>
- </property>
- </bean>
- </list>
- </property>
- </bean>
基于Java-config方式会更加简单一点,先让你的mvc配置继承WebMvcConfigurerAdapter,再重写configureMessageConverters方法,加入jackson包,在controller使用@ResponseBody注解,OK!
如果要全局支持jsonp(支持jsonp的做法:可以在controller的方法返回String类型,接收一下callback,然后callback调用一下json结果就可以),可以再加一个StringHttpMessageConverter,不仅能解决中文乱码,还能把json里面的换行\r\n去掉.
- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />
- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
- <property name="messageConverters">
- <list>
- <bean class="org.springframework.http.converter.StringHttpMessageConverter">
- <property name="supportedMediaTypes">
- <list>
- <value>text/html; charset=UTF-8</value>
- <value>application/json;charset=UTF-8</value>
- </list>
- </property>
- </bean>
- <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
- <property name="supportedMediaTypes">
- <list>
- <value>text/html; charset=UTF-8</value>
- <value>application/json;charset=UTF-8</value>
- </list>
- </property>
- </bean>
- </list>
- </property>
- </bean>