springmvc 后台用map封装前台传的参数

package com.util;


import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;


import javax.servlet.http.HttpServletRequest;


public class PageData extends HashMap implements Map{

private static final long serialVersionUID = 1L;

Map map = null;
HttpServletRequest request;

public PageData(HttpServletRequest request){
this.request = request;
Map properties = request.getParameterMap();
Map returnMap = new HashMap(); 
Iterator entries = properties.entrySet().iterator(); 
Map.Entry entry; 
String name = "";  
String value = "";  
while (entries.hasNext()) {
entry = (Map.Entry) entries.next(); 
name = (String) entry.getKey(); 
Object valueObj = entry.getValue(); 
value = null;
if(null == valueObj){ 
value = ""; 
}else if(valueObj instanceof String[]){ 
String[] values = (String[])valueObj;
for(int i=0;i<values.length;i++){
if(value==null)
value = (values[i]==null ? "" : values[i]);
else
value += "," + (values[i]==null ? "" : values[i]);
}
}else{
value = valueObj.toString(); 
}
returnMap.put(name, value); 
}
map = returnMap;
}

public PageData() {
map = new HashMap();
}

@Override
public Object get(Object key) {
Object obj = null;
if(map.get(key) instanceof Object[]) {
Object[] arr = (Object[])map.get(key);
obj = request == null ? arr:(request.getParameter((String)key) == null ? arr:arr[0]);
} else {
obj = map.get(key);
}
return obj;
}

public String getString(Object key) {
return (String)get(key);
}

@SuppressWarnings("unchecked")
@Override
public Object put(Object key, Object value) {
return map.put(key, value);
}

@Override
public Object remove(Object key) {
return map.remove(key);
}


public void clear() {
map.clear();
}


public boolean containsKey(Object key) {
return map.containsKey(key);
}


public boolean containsValue(Object value) {
return map.containsValue(value);
}


public Set entrySet() {
return map.entrySet();
}


public boolean isEmpty() {
return map.isEmpty();
}


public Set keySet() {
return map.keySet();
}


@SuppressWarnings("unchecked")
public void putAll(Map t) {
map.putAll(t);
}


public int size() {
return map.size();
}


public Collection values() {
return map.values();
}

public Object clone() {    
PageData pd = new PageData();   
        for (Iterator keyIt = this.keySet().iterator(); keyIt.hasNext();) {    
            Object key = keyIt.next();    
            pd.put(key, this.get(key));    
        }
        return pd;    
    }


/**
* 判断两个对象指定字段值是否一致
* @param pd
* @param fields
* @return
*/
public boolean equals(PageData pd, List<String> fields) {
boolean isEqual = true;

if(pd!=null && fields!=null && !fields.isEmpty()){
for (String field : fields) {
isEqual = isEqual && this.isEqual(this.getString(field), pd.getString(field));
}
}

return isEqual;
}


/**
* 判断两个字符串是否一致
* @param str1
* @param str2
* @return
*/
private boolean isEqual(String str1, String str2) {
boolean isAllNull = (str1==null && str2==null);
boolean isAllEmpty = (str1!=null && str1.trim().equals("") && str2!=null && str2.trim().equals(""));

return isAllNull || isAllEmpty || (str1!=null && str2!=null && str2.trim().equals(str1.trim()));

}

import javax.servlet.http.HttpServletRequest;

import org.springframework.web.multipart.MultipartFile;

import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.MultipartResolver;

/**

* 如果前台传值为enctype="multipart/form-data"传值文件，获取其他input值必须封装request

*这是request.getParameter(" ")就能获取到值了

* @param str1
* @param str2
* @return
*/

public HttpServletRequest getMultipartRequest(HttpServletRequest  request){

//封装有文件提交的request
MultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());
MultipartHttpServletRequest multipartRequest = resolver.resolveMultipart(request);

return request;

}

}