一文带你揭秘SpringMvc参数值映射

目录

• 前言
• 一.处理过程的抽象
• 二.常见传参类型
• 1.自定义对象类型
• 2.@RequestParam注解参数
• 3.@RequestBody注解参数
• 4.简单类型，无@RequestParam注解
• 总结

@RequestMapping("/test1")
public String methodForObjectParam (FamilyDTO familyDTO){
    System.out.println("familyDTO:"+JSON.toJSONString(familyDTO));
    return "";
}

@RequestMapping("/test3")
public String methodForRequestParam (@RequestParam Integer param){
    System.out.println("RequestParam:"+JSON.toJSONString(param));
    return "";
}

@RequestMapping("/test6")
public String methodForRequestBody (@RequestBody FamilyDTO familyDTO){
    System.out.println("methodForNormalParam:"+JSON.toJSONString(familyDTO));
    return "";
}

@RequestMapping("/test5")
public String methodForNormalParam (Integer param){
    System.out.println("methodForNormalParam:"+JSON.toJSONString(param));
    return "";
}

public Object invokeForRequest(NativeWebRequest request, @Nullable ModelAndViewContainer mavContainer,
      Object... providedArgs) throws Exception {
   //从request中读取，转化参数值
   Object[] args = getMethodArgumentValues(request, mavContainer, providedArgs);
   if (logger.isTraceEnabled()) {
      logger.trace("Invoking "" + ClassUtils.getQualifiedMethodName(getMethod(), getBeanType()) +
            "" with arguments " + Arrays.toString(args));
   }
   //方法的调用
   Object returnValue = doInvoke(args);
   if (logger.isTraceEnabled()) {
      logger.trace("Method [" + ClassUtils.getQualifiedMethodName(getMethod(), getBeanType()) +
            "] returned [" + returnValue + "]");
   }
   return returnValue;
}