IMap 对map的功能的强化

Posted 2020-08-26 java新手

为了解决表单提交获得数据的方便性，我们将map的功能进行加强，表单提交的数据会自动将页面数据放入PageData对象中,当从页面获取数据时 new的时候要传request。
request.getParameter(arg0): get(arg0)或getString(arg0)
 request.getParameterValues(arg0): getValues(arg0)方法
本类也可以当做一个普通的Map使用，new的时候不要传参数

package com.jit.el.common;
import java.net.URLDecoder;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang.StringUtils;

public class IMap extends HashMap{
    

    private static final long serialVersionUID = 1L;
    Map map = null;
    HttpServletRequest request;
    //从页面获取数据
    public IMap(HttpServletRequest request){
        map = new HashMap();
        this.request = request;
        Map requestParams = request.getParameterMap();
        Set<Map.Entry> entrySet = requestParams.entrySet();
        for (Map.Entry entry : entrySet) {
            String key = (String) entry.getKey();
            String[] values = (String[]) entry.getValue();
            String value;
            try {
                value = transParamDecode(values[0], "UTF-8");
                
//                value = value.replaceAll( "(?i)<script", "＜script" );
//                value = value.replaceAll( "(?i)</script>", "＜/script＞" );
                
                map.put(key, value);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    
    
    //普通的Map
    public IMap() {
        map = new HashMap();
    }
    
    public Object get(Object key) {
        return map.get(key);
    }
    
    //本方法只能用于从页面获取数组，例如相同名字的checkbox
    public String[] getValues(Object key) {
        return request == null ? null:request.getParameterValues((String)key);
    }
    
    public String getString(Object key) {
        Object o = get(key);
        return o == null? null:o.toString();
    }
    
    public String getString(String name, String defaultValue) {
        String value = getString(name);
        return value == null ? defaultValue : value;
    }
    
    /**
     * get names
     * @return String[]
     */
    public String[] getNames() {
        String[] names = (String[]) keySet().toArray(new String[0]);
        Arrays.sort(names);
        return names;
    }
    
    /**
     * get int
     * @param name
     * @return int
     */
    public int getInt(String name) {
        return getInt(name, 0);
    }
    
    /**
     * get int
     * @param name
     * @param defaultValue
     * @return int
     */
    public int getInt(String name, int defaultValue) {
        String value = getString(name, "");
        return "".equals(value) ? defaultValue : Integer.parseInt(value);
    }
    
    /**
     * get double
     * @param name
     * @return double
     */
    public double getDouble(String name) {
        return getDouble(name, 0);
    }
    
    /**
     * get double
     * @param name
     * @param defaultValue
     * @return double
     */
    public double getDouble(String name, double defaultValue) {
        String value = getString(name, "");
        return "".equals(value) ? defaultValue : Double.parseDouble(value);
    }
    
    /**
     * get boolean
     * @param name
     * @return boolean
     */
    public boolean getBoolean(String name) {
        return getBoolean(name, false);
    }
    
    /**
     * get boolean
     * @param name
     * @param defaultValue
     * @return boolean
     */
    public boolean getBoolean(String name, boolean defaultValue) {
        String value = getString(name, "");
        return "".equals(value) ? defaultValue : Boolean.valueOf(value).booleanValue();
    }
    
    
    @SuppressWarnings("unchecked")
    public Object put(Object key, Object value) {
        return map.put(key, value);
    }
    
    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();
    }
    
    private static String transParamDecode(String param, String charset) throws Exception {
        if (param == null) {
            return null;
        }
        return URLDecoder.decode(param.replaceAll("%", "%25"), charset);
    }
}