详解获取Spring MVC中所有RequestMapping以及对应方法和参数

在Spring MVC中想要对每一个URL进行权限控制，不想手工整理这样会有遗漏，所以就动手写程序了。代码如下：

  
  @RequestMapping(value = "/maps", produces = "application/json; charset=utf-8")
  @ResponseBody 
  public Object getMapPaths(){
    String result="";
     RequestMappingHandlerMapping rmhp = springHelper.getObject(RequestMappingHandlerMapping.class); 
      Map map = rmhp.getHandlerMethods(); 
      for(RequestMappingInfo info : map.keySet()){ 
 result +=info.getPatternsCondition().toString().replace("[", "").replace("]", "")+ "t"   ;
 HandlerMethod hm=map.get(info);
 result +=hm.getBeanType().getName()+ "t"   ;
 result +=getMethodParams(hm.getBeanType().getName(),hm.getMethod().getName())+ "t"; 
 result +=info.getProducesCondition().toString().replace("[", "").replace("]", "")+ "t"   ;
 result += "rn"; 
      } 
    return result;
  }

getMethodParams是专门用于获取方法中参数名称的函数，因为用Java自身的反射功能是获取不到的，浪费我不少时间，后来网上看到JBOSS的JAVAssist类可以。其实这个JAVAssist类库也被封装在Mybatis中，如果系统使用了Mybatis，则直接引入可以使用了。

import org.apache.ibatis.javassist.*;
import org.apache.ibatis.javassist.bytecode.*;

getMethodParams 的实现如下：

  private String getMethodParams(String className,String methodName){
    String result="";
    try{
      ClassPool pool=ClassPool.getDefault();
ClassClassPath classPath = new ClassClassPath(this.getClass());
pool.insertClassPath(classPath);
      CtMethod cm =pool.getMethod(className, methodName); 
     // 使用javaassist的反射方法获取方法的参数名 
      MethodInfo methodInfo = cm.getMethodInfo(); 
      CodeAttribute codeAttribute = methodInfo.getCodeAttribute(); 
      LocalVariableAttribute attr = (LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag); 
      result=cm.getName() + "(";
      if (attr == null) { 
 return result + ")";
      } 
      CtClass[] pTypes=cm.getParameterTypes();
      String[] paramNames = new String[pTypes.length]; 
      int pos = Modifier.isStatic(cm.getModifiers()) ? 0 : 1; 
      for (int i = 0; i < paramNames.length; i++) {
 if(!pTypes[i].getSimpleName().startsWith("HttpServletRe")){
   result += pTypes[i].getSimpleName();
   paramNames[i] = attr.variableName(i + pos); 
   result += " " + paramNames[i]+","; 
 }
      }
      if(result.endsWith(",")){
 result=result.substring(0, result.length()-1);
      }
      result+=")";
    }catch(Exception e){
      e.printStackTrace();
    }
    return result;
  }

这样就可以获得每个URL路径与期对应的方法声明了。

另外SpringHelper是自己封装的Spring工具类，可以用来直接获取Spring管理的Bean，代码如下：

import java.util.Locale;
import javax.servlet.http.HttpServletRequest;
import org.apache.log4j.Logger;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.i18n.cookieLocaleResolver;


@Component
public class SpringHelper implements ApplicationContextAware {
  // 日志输出类
  private static Logger logger = Logger.getLogger(SpringHelper.class);

  // 当前的Spring上下文
  private static ApplicationContext applicationContext;

  @Override
  public void setApplicationContext(ApplicationContext arg0)
      throws BeansException {
    applicationContext = arg0;
  }

  
  public Object getObject(String beanName) {
    Object object = null;
    try {
      object = applicationContext.getBean(beanName);
    } catch (Exception e) {
      logger.error(e);
    }
    return object;
  }


  
  public ApplicationContext getContext() {
    return applicationContext;
  }

  
  public  T getObject(Class clazz) {
    try {
      return applicationContext.getBean(clazz);
    } catch (Exception e) {
      logger.error(e);
    }
    return null;
  }


  public String getMessage(String code,Locale locale){
    String message;
    try{
      message=applicationContext.getMessage(code, null, locale);
    }catch(Exception e){
      logger.error(e);
      message="";
    }
    return message;
  }

  
  public String getMessage(String code,HttpServletRequest request){
    String message;
    try{
      message=applicationContext.getMessage(code, null, getCurrentLocale(request));
    }catch(Exception e){
      logger.error(e);
      message="zh_CN";
    }
    return message;
  }

  
  public Locale getCurrentLocale(HttpServletRequest request){
    return resolver.resolveLocale(request);
  }

  //cookie本地语言解析器，Spring提供
  @Autowired
  cookieLocaleResolver resolver;
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。