PageData自定义封装类

PageData 的自定义封装

PageData 的作用：
1.接受参数更加具有灵活性，
2.pagedata继承了hashMap，同时实现了 map类，可以自动将前台传递过来的参数转换为Map对象
3.在与xml层交互时，涉及到实体类和表中字段名冲突问题，pagaData不用考虑，可直接把参数塞到pagedata中，传给xml层处理
放代码

先写BaseController

/**
 * 
 */
package com.ssm.util;
import javax.servlet.http.HttpServletRequest;
 
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.ModelAndView;
import com.ssm.util.PageData;
/**
 *  @description
 *
 * @author Gaogzh
 *
 * @date 2018-4-14
 */
public class BaseController<T> {
	protected Logger logger = Logger.getLogger(this.getClass());
 
	private static final long serialVersionUID = 6357869213649815390L;
	
	/**
	 * 得到PageData
	 */
	public PageData getPageData(){
		return new PageData(this.getRequest());
	}
	
	/**
	 * 得到ModelAndView
	 */
	public ModelAndView getModelAndView(){
		return new ModelAndView();
	}
	
	/**
	 * 得到request对象
	 */
	public HttpServletRequest getRequest() {
		HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
		return request;
	}
 
	/**
	 * 得到32位的uuid
	 * @return
	 */
	/*public String get32UUID(){
		
		return UuidUtil.get32UUID();
	}
	
	*//**
	 * 得到分页列表的信息 
	 *//*
	public Page getPage(){
		
		return new Page();
	}*/
	
	public static void logBefore(Logger logger, String interfaceName){
		logger.info("");
		logger.info("start");
		logger.info(interfaceName);
	}
	
	public static void logAfter(Logger logger){
		logger.info("end");
		logger.info("");
	}
 
}

2.pageData 自定义类

/**
 * 
 */
package com.ssm.util;
 
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
 
import javax.servlet.http.HttpServletRequest;
 
/**
 *  @description
 *
 * @author Gaogzh
 *
 * @date 2018-4-14
 */
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(); 
			if(null == valueObj){ 
				value = ""; 
			}else if(valueObj instanceof String[]){ 
				String[] values = (String[])valueObj;
				for(int i=0;i<values.length;i++){ 
					 value = values[i] + ",";
				}
				value = value.substring(0, value.length()-1); 
			}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);
	}
	public Number getNumber(Object key)
	{
		return (Number)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) {
		// TODO Auto-generated method stub
		return map.containsKey(key);
	}
	public boolean containsValue(Object value) {
		// TODO Auto-generated method stub
		return map.containsValue(value);
	}
	public Set entrySet() {
		// TODO Auto-generated method stub
		return map.entrySet();
	}
	public boolean isEmpty() {
		// TODO Auto-generated method stub
		return map.isEmpty();
	}
	public Set keySet() {
		// TODO Auto-generated method stub
		return map.keySet();
	}
	@SuppressWarnings("unchecked")
	public void putAll(Map t) {
		// TODO Auto-generated method stub
		map.putAll(t);
	}
	public int size() {
		// TODO Auto-generated method stub
		return map.size();
	}
	public Collection values() {
		// TODO Auto-generated method stub
		return map.values();
	}
}

3. 引用

@Controller
public class DeptTaskArenaController extends BaseController{
	public ModelAndView toArenaEdit(DocTask docTask) {
		PageData pd = this.getPageData();
		PageData pd = new PageData();
		}
}