HTTP请求bean转换工具

程序员文章站 2022-07-11 14:19:55

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Java泛型详解：http://blog.csdn.net/jinuxwu/article/details/6771121
http://www.cnblogs.com/tech-bird/p/3516325.html
http://lichaozhangobj.iteye.com/blog/476911
<? extends SomeClass>与<T extends SomeClass>的区别：http://blog.csdn.net/cgf1993/article/details/50754584
instanceof 与isAssignableFrom ：http://blog.csdn.net/kjfcpua/article/details/7045207
Java String和Date的转换：http://www.cnblogs.com/bmbm/archive/2011/12/06/2342264.html
测试主类：

 package test;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import util.JsonUtils;

/**
 * 根据请求转换请求参数bean
 * @author donald
 * @date 2017-1-6
 * @time 上午11:29:37
 */
public class RequestParamUtils {
	private static final Logger log = LoggerFactory.getLogger(RequestParamUtils.class);
	private static final String SET_METHOD_PREFIX = "set";
	private static final String GET_METHOD_PREFIX = "get";
	private static final String GETCLASS_METHOD_SUFFIX = "class";
	private static SimpleDateFormat time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	private static volatile RequestParamUtils instance = null;
    public static synchronized RequestParamUtils getInstance(){
    	if (instance == null){
    		instance = new RequestParamUtils();
    	}
    	return instance;
    }
    /**
     * 转化bean
     * @param request
     * @param clazz
     * @return
     */
   
      @SuppressWarnings({ "rawtypes", "unchecked" })
	public  <T> T getParamBean(HttpServletRequest request, Class<T> clazz) {
		T bean = null;
		try {
			bean = clazz.newInstance();
		} catch (InstantiationException e) {
			log.error("==========请求参数模型实例化错误");
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			log.error("==========无法访问参数模型构造函数");
			e.printStackTrace();
		}	
		Method[] allGetMethodList = clazz.getMethods();
		for(Method m : allGetMethodList){
			if(m.getName().startsWith(GET_METHOD_PREFIX)){
				if(isHaveGetProperties(clazz,m)){
					log.debug("========Get Method Name:"+m.getName());
					String setMethodName = SET_METHOD_PREFIX +  m.getName().substring(3,m.getName().length());
					log.debug("========set Method Name:"+setMethodName);
					Class type = getPropertiesType(clazz,m);
					if(type != null){
						try {
							Method setM = clazz.getMethod(setMethodName, type);
							String fieldName =  getMethodProperty(m);
							String mProperty = request.getParameter(fieldName);
							Object mobj = null;
							if(mProperty != null)
								mobj = ConvertStringToObject(mProperty,type);
							try {
								if(mobj != null)
									setM.invoke(bean, mobj);
							} catch (IllegalArgumentException e) {
								log.error("==========参数异常");
								e.printStackTrace();
							} catch (IllegalAccessException e) {
								log.error("==========非法访问");
								e.printStackTrace();
							} catch (InvocationTargetException e) {
								log.error("==========目标调用异常");
								e.printStackTrace();
							}
						} catch (SecurityException e) {
							log.error("==========无访问权限");
							e.printStackTrace();
						} catch (NoSuchMethodException e) {
							log.error("==========类中没有对应的方法:"+setMethodName);
							e.printStackTrace();
						}
					}
					
				}
				   
			}
		}
		return (T)bean;
	}
    /**
     * 从Map转换bean
     * @param params
     * @param clazz
     * @return
     */
	@SuppressWarnings("rawtypes")
	public  <T> T getParamBeanFromMap(Map<String,Object> params, Class<T> clazz) {
		T bean = null;
		try {
			bean = clazz.newInstance();
		} catch (InstantiationException e) {
			log.error("==========请求参数模型实例化错误");
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			log.error("==========无法访问参数模型构造函数");
			e.printStackTrace();
		}	
		Method[] allGetMethodList = clazz.getMethods();
		for(Method m : allGetMethodList){
			if(m.getName().startsWith(GET_METHOD_PREFIX)){
				if(isHaveGetProperties(clazz,m)){
					log.debug("========Get Method Name:"+m.getName());
					String setMethodName = SET_METHOD_PREFIX +  m.getName().substring(3,m.getName().length());
					log.debug("========set Method Name:"+setMethodName);
					Class type = getPropertiesType(clazz,m);
					if(type != null){
						try {
							Method setM = clazz.getMethod(setMethodName, type);
							String fieldName =  getMethodProperty(m);
							Object mProperty = params.get(fieldName);
							try {
								if(mProperty != null)
									setM.invoke(bean, mProperty);
							} catch (IllegalArgumentException e) {
								log.error("==========参数异常");
								e.printStackTrace();
							} catch (IllegalAccessException e) {
								log.error("==========非法访问");
								e.printStackTrace();
							} catch (InvocationTargetException e) {
								log.error("==========目标调用异常");
								e.printStackTrace();
							}
						} catch (SecurityException e) {
							log.error("==========无访问权限");
							e.printStackTrace();
						} catch (NoSuchMethodException e) {
							log.error("==========类中没有对应的方法:"+setMethodName);
							e.printStackTrace();
						}
					}
					
				}
				   
			}
		}
		return (T)bean;
	}
     
	/**
	 * clazz 是否存在m对应的属性
	 * @param clazz
	 * @param m
	 * @return
	 */
	private  boolean isHaveGetProperties(Class<?> clazz,Method m){
		boolean flag = false;
		String fieldName = getMethodProperty(m);
		log.debug("=========Get Method Field Name:"+fieldName);
	    try {
			if(!fieldName.equals(GETCLASS_METHOD_SUFFIX)&&!m.isAnnotationPresent(Transient.class)){
				if(clazz.getDeclaredField(fieldName)!= null) 
					flag = true;
			}
		} catch (SecurityException e) {
			log.error("==========无访问权限");
			e.printStackTrace();
		} catch (NoSuchFieldException e) {
			log.error("==========类中没有对应的方法属性:"+fieldName);
			e.printStackTrace();
		}
		return flag;
	}
    /**
     * 获取m方法对应属性的类型
     * @param clazz
     * @param m
     * @return
     */
	@SuppressWarnings("rawtypes")
	private  Class getPropertiesType(Class<?> clazz,Method m){
		Class type = null;
		String fieldName = getMethodProperty(m);
	    try {
			if(!fieldName.equals(GETCLASS_METHOD_SUFFIX)){
				Field f = clazz.getDeclaredField(fieldName);
				type = f.getType();
				log.debug(fieldName+" Type:"+type.toString());
			}
		} catch (SecurityException e) {
			log.error("==========无访问权限");
			e.printStackTrace();
		} catch (NoSuchFieldException e) {
			log.error("==========类中没有对应的方法属性:"+fieldName);
			e.printStackTrace();
		}
		return type;
	}
	/**
	 * 获取方法属性名
	 * @param m
	 * @return
	 */
    private  String getMethodProperty(Method m){
    	String fieldName = m.getName().substring(3,m.getName().length());
		fieldName = fieldName.substring(0, 1).toLowerCase()+fieldName.substring(1, fieldName.length());
		return fieldName;
    }
    /**
     * 
     * @param param
     * @param type
     * @return
     */
	@SuppressWarnings("unchecked")
	private <T> T ConvertStringToType (String param,Class<T> type){
    	T obj =null;
    		obj = (T) param;
    	return obj;
    }
	/**
	 * 转化类型
	 * @param param
	 * @param type
	 * @return
	 */
	@SuppressWarnings({ "deprecation"})
	private Object ConvertStringToObject(String param,Class<?> type){
		Object obj =null;
    	if(type.isAssignableFrom(String.class)){
    		obj = String.valueOf(param);
    	}
    	if(type.isAssignableFrom(Integer.class)){
    		obj = Integer.valueOf(param);
    	}
    	if(type.isAssignableFrom(Double.class)){
    		obj = Double.valueOf(param);
    	}
    	if(type.isAssignableFrom(Date.class)){
    		try {
				obj = time.parse(param);
			} catch (ParseException e) {
				log.error("=========时间日期解析异常");
				e.printStackTrace();
			}
    	}
    	return obj;
	}
    @SuppressWarnings({ "unchecked", "rawtypes" })
	public static void main(String[] args) {
    	//从map转换bean
    	Map params = new HashMap<String, Object>();
		params.put("userName", "donald");
		params.put("userAge", 20);
		params.put("borth", new Date());
		params.put("weight", 56.3);
		Param pm = new Param(); 
		pm = RequestParamUtils.getInstance().getParamBeanFromMap(params,Param.class);
		log.info("======result："+JsonUtils.toJson(pm));
		
		//测试类型转换方法ConvertStringToType，这种强制转化的参数设置方式，容易出现参数异常
		String ss = "user";
		String it = "2";
		String du = "50.36";
		String date = "2016-10-23 12:05:56";
//		Object obj = RequestParamUtils.getInstance().ConvertStringToType(ss, String.class);
		/*log.info("String:"+RequestParamUtils.getInstance().ConvertStringToType(ss, String.class));
		log.info("it:"+RequestParamUtils.getInstance().ConvertStringToType(it, Integer.class));
		log.info("du:"+RequestParamUtils.getInstance().ConvertStringToType(du, Double.class));
		log.info("date:"+RequestParamUtils.getInstance().ConvertStringToType(date, java.util.Date.class));*/
		
		//测试类型转换方法ConvertStringToObject，尽量用这种方式，obj实际为Class<?> type
		Object obj = RequestParamUtils.getInstance().ConvertStringToObject(ss, String.class);
		log.info("String:"+RequestParamUtils.getInstance().ConvertStringToObject(ss, String.class));
		log.info("it:"+RequestParamUtils.getInstance().ConvertStringToObject(it, Integer.class));
		log.info("du:"+RequestParamUtils.getInstance().ConvertStringToObject(du, Double.class));
		log.info("date:"+RequestParamUtils.getInstance().ConvertStringToObject(date, java.util.Date.class));
	}
}

实体类：

package test;

import java.io.Serializable;
import java.util.Date;

public class Param implements Serializable{

	/**
	 * 
	 */
	private static final long serialVersionUID = 7834236561543851887L;
    private String userName;
    private Integer userAge;
    private Date borth;
    private Double weight;
    
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public Integer getUserAge() {
		return userAge;
	}
	public void setUserAge(Integer userAge) {
		this.userAge = userAge;
	}
	public Date getBorth() {
		return borth;
	}
	public void setBorth(Date borth) {
		this.borth = borth;
	}
	public Double getWeight() {
		return weight;
	}
	public void setWeight(Double weight) {
		this.weight = weight;
	}
    
}

控制台输出：
2017-1-6 16:28:11 test.RequestParamUtils main
信息: ======result：{"weight":56.3,"userName":"donald","userAge":20,"borth":{"time":1483691291811,"minutes":28,"seconds":11,"hours":16,"month":0,"year":117,"timezoneOffset":-480,"day":5,"date":6}}
2017-1-6 16:28:11 test.RequestParamUtils main
信息: String:user
2017-1-6 16:28:11 test.RequestParamUtils main
信息: it:2
2017-1-6 16:28:11 test.RequestParamUtils main
信息: du:50.36
2017-1-6 16:28:11 test.RequestParamUtils main
信息: date:Sun Oct 23 12:05:56 CST 2016

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