SpringMVC整合fastjson-1.1.41
本文内容纲要：
以前用fastjson也只是硬编码，就好像这篇博文写的http://blog.csdn.net/jadyer/article/details/24395015
昨天心血来潮突然想和SpringMVC整合，然后利用@ResponseBody注解的方式序列化输出json字符串
下面是研究成果
首先是applicationContext.xml中的相关配置
<?xmlversion="1.0"encoding="UTF-8"?>
<beansxmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd">
<context:component-scanbase-package="com.jadyer"/>
<mvc:annotation-driven>
<mvc:message-convertersregister-defaults="true">
<beanclass="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
<propertyname="supportedMediaTypes"value="text/html;charset=UTF-8"/>
<propertyname="features">
<array>
<value>WriteMapNullValue</value>
<value>WriteNullStringAsEmpty</value>
</array>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<!--fastjson-1.1.41与SpringMVC整合-->
<!--
1)若按照jackson和SpringMVC的整合方式,应按照下面的写法,但测试发现这样会报告"HTTPStatus406"
Theresourceidentifiedbythisrequestisonlycapableofgeneratingresponses
withcharacteristicsnotacceptableaccordingtotherequest"accept"headers.
2)测试通过的整合方式为上面那样在mvc:annotation-driven里面进行注册
3)supportedMediaTypes增加[text/html;charset=UTF-8]值,是为了兼容IE6
否则[application/json]值在IE6中会导致弹出对话框询问是否保存文件,而firefox等高级浏览器会正常打印json字符串
4)若像下面这样给supportedMediaTypes属性赋两个值[text/html;charset=UTF-8]和[application/json],则[application/json]是无效的
因为此时应答给浏览器(或者说请求方)的Content-Type头信息都是[text/html;charset=UTF-8],所以给它一个值就行了
如果给supportedMediaTypes的值为[application/json],则应答给浏览器的Content-Type头信息就是[application/json;charset=UTF-8]
5)关于features属性,不是serializerFeature,而是features,详见FastJsonHttpMessageConverter.java
它是用来控制json序列化输出时的一些额外属性,比如说该字段是否输出、输出时key使用单引号还是双引号、key不使用任何引号等等
QuoteFieldNames----------输出key时是否使用双引号,默认为true
WriteMapNullValue--------是否输出值为null的字段,默认为false
WriteNullNumberAsZero----数值字段如果为null,输出为0,而非null
WriteNullListAsEmpty-----List字段如果为null,输出为[],而非null
WriteNullStringAsEmpty---字符类型字段如果为null,输出为"",而非null
WriteNullBooleanAsFalse--Boolean字段如果为null,输出为false,而非null
6)通常在网上搜到的fastjson和springMVC整合的例子中都像下面注释的代码那样给了两个属性WriteMapNullValue和QuoteFieldNames
这就表示为json解析器设置QuoteFieldNames和WriteMapNullValue的值为true,即输出时key使用双引号,同时也输出值为null的字段
7)输出时某字段为String类型,且值为null,此时若需要其输出,且输出值为空字符串,则需同时赋值WriteMapNullValue和WriteNullStringAsEmpty
经测试,若只赋值WriteNullStringAsEmpty,则不会输出该字段..加上WriteMapNullValue属性后,便输出了,且输出值不是null,而是预期的空字符串
-->
<!--
<beanclass="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<propertyname="messageConverters">
<list>
<beanclass="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
<propertyname="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
<value>application/json</value>
</list>
</property>
<propertyname="serializerFeature">
<array>
<value>QuoteFieldNames</value>
<value>WriteMapNullValue</value>
</array>
</property>
</bean>
</list>
</property>
</bean>
-->
<!--
<beanclass="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<propertyname="messageConverters">
<list>
<beanclass="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<propertyname="supportedMediaTypes"value="text/html;charset=UTF-8"/>
</bean>
</list>
</property>
</bean>
-->
</beans>
接着是SpringMVC中的Controller
packagecom.jadyer.controller;
importjava.io.IOException;
importjava.io.PrintWriter;
importjavax.annotation.Resource;
importjavax.servlet.http.HttpServletResponse;
importorg.springframework.stereotype.Controller;
importorg.springframework.web.bind.annotation.RequestMapping;
importorg.springframework.web.bind.annotation.ResponseBody;
importcom.alibaba.fastjson.JSON;
importcom.jadyer.model.LoginResult;
@Controller
@RequestMapping(value="/account")
publicclassAccountController{
@Resource
privateAccountServiceaccountService;
// @RequestMapping(value="/login")
// publicStringlogin(Stringusername,Stringpassword,HttpServletResponseresponse)throwsIOException{
// response.setContentType("text/plain;charset=UTF-8");
// response.setHeader("Cache-Control","no-cache");
// response.setHeader("Pragma","no-cache");
// response.setDateHeader("Expires",0);
// PrintWriterout=response.getWriter();
// out.write(JSON.toJSONString(accountService.login(username,password)));
// out.flush();
// out.close();
// returnnull;
// }
@ResponseBody
@RequestMapping(value="/login")
publicLoginResultlogin(Stringusername,Stringpassword){
LoginResultresult=newLoginResult();
//验签过程暂略....
result=accountService.login(username,password);
returnresult;
}
}
最后是login()方法的应答实体类LoginResult.java
packagecom.jadyer.model;
publicclassLoginResult{
privateStringrespCode;//应答码
privateStringrespDesc;//应答描述
privateStringuserId;//用户编号
privateStringusername;//用户名
privateStringmobileNo;//用户手机号
privateStringintegral;//用户拥有的积分
/*--对应的setter和getter略--*/
}
本文内容总结：
原文链接：https://www.cnblogs.com/exmyth/p/4563673.html