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);
}
}