Three ways for SpringMVC to return json data_javascript skills

Spring MVC is a follow-up product of SpringFrameWork and has been integrated into Spring Web Flow. The Spring framework provides full-featured MVC modules for building web applications. Using Spring's pluggable MVC architecture, when using Spring for WEB development, you can choose to use Spring's SpringMVC framework or integrate other MVC development frameworks, such as Struts1, Struts2, etc.

1. The first method is a product of the spring2 era, that is, each json view controller is configured with a Jsoniew.

For example: cf48d914a6e61bace0b746a13cd1a882

or295f6586d4dd3c16c76b3755ccad3bc9

You also need to use Jackson’s jar package.

2. The second type uses JSON tools to serialize objects into json. Common tools include Jackson, fastjson, and gson.

Use HttpServletResponse, and then get response.getOutputStream() or response.getWriter()

Output directly.

Example:

public class JsonUtil 
{ 
  private static Gson gson=new Gson(); 
 
  /** 
   * @MethodName : toJson 
   * @Description : 将对象转为JSON串，此方法能够满足大部分需求 
   * @param src 
   *      :将要被转化的对象 
   * @return :转化后的JSON串 
   */ 
  public static String toJson(Object src) { 
    if (src == null) { 
      return gson.toJson(JsonNull.INSTANCE); 
    } 
    return gson.toJson(src); 
  } 
} 

3. The third way to use spring mvc3 annotation @ResponseBody

For example:

@ResponseBody 
 @RequestMapping("/list") 
 public List<String> list(ModelMap modelMap) { 
  String hql = "select c from Clothing c "; 
  Page<Clothing> page = new Page<Clothing>(); 
  page.setPageSize(6); 
  page = clothingServiceImpl.queryForPageByHql(page, hql); 
   
  return page.getResult(); 
 }

Then use the default configuration of spring mvc to return json, but you need the jackson jar package.

Note: When 463d7d566f84e66ad507872587b9c14c is used in springMVC-servlet.xml, if AnnotationMethodHandlerAdapter has been injected by default before 3.1, and RequestMappingHandlerAdapter has been injected by default after 3.1, just add the jar package mentioned above. Yes!

If you manually inject RequestMappingHandlerAdapter, you can set it like this

The configuration is as follows:

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter" 
    p:ignoreDefaultModelOnRedirect="true" > 
      <property name="messageConverters"> 
        <list> 
          <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/> 
        </list> 
      </property> 
    </bean> 

Add package

jackson-mapper-asl-*.jar
jackson-core-asl-*.jar

It can be seen that the usage methods are getting simpler and simpler, and programmers are getting stupider and stupider. I don’t know whether this is a good thing or a bad thing...

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