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| import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Vector;
/**
* @Author: XiongFeng
* @Description: 对Request请求重新包装
* @Date: Created in 11:17 2018/4/13
*/
public class ParameterRequestWrapper extends HttpServletRequestWrapper {
private Map<String , String[]> params = new HashMap<String, String[]>();
@SuppressWarnings("unchecked")
public ParameterRequestWrapper(HttpServletRequest request) {
// 将request交给父类，以便于调用对应方法的时候，将其输出，其实父亲类的实现方式和第一种new的方式类似
super(request);
//将参数表，赋予给当前的Map以便于持有request中的参数
this.params.putAll(request.getParameterMap());
}
//重载一个构造方法
public ParameterRequestWrapper(HttpServletRequest request , Map<String , Object> extendParams) {
this(request);
addAllParameters(extendParams);//这里将扩展参数写入参数表
}
/**
* 复写获取key的方法
*/
@Override
public Enumeration getParameterNames() {
Vector names = new Vector(params.keySet());
return names.elements();
}
/**
* 复写获取值value的方法
*/
@Override
public String getParameter(String name) {
Object v = params.get(name);
if (v == null) {
return null;
} else if (v instanceof String[]) {
String[] strArr = (String[]) v;
if (strArr.length > 0) {
return strArr[0];
} else {
return null;
}
} else if (v instanceof String) {
return (String) v;
} else {
return v.toString();
}
}
@Override
public String[] getParameterValues(String name) {
Object v = params.get(name);
if (v == null) {
return null;
} else if (v instanceof String[]) {
return (String[]) v;
} else if (v instanceof String) {
return new String[] { (String) v };
} else {
return new String[] { v.toString() };
}
}
public void addAllParameters(Map<String , Object>otherParams) {//增加多个参数
for(Map.Entry<String , Object>entry : otherParams.entrySet()) {
addParameter(entry.getKey() , entry.getValue());
}
}
public void addParameter(String name , Object value) {//增加参数
if(value != null) {
if(value instanceof String[]) {
params.put(name , (String[])value);
}else if(value instanceof String) {
params.put(name , new String[] {(String)value});
}else {
params.put(name , new String[] {String.valueOf(value)});
}
}
}
/** 简单封装，请根据需求改进 */
public void addObject(Object obj) {
Class<?> clazz = obj.getClass();
Method[] methods = clazz.getMethods();
try {
for (Method method : methods) {
if (!method.getName().startsWith("get")) {
continue;
}
Object invoke = method.invoke(obj);
if (invoke == null || "".equals(invoke)) {
continue;
}
String filedName = method.getName().replace("get", "");
filedName = WordUtils.uncapitalize(filedName);
if (invoke instanceof Collection) {
Collection collections = (Collection) invoke;
if (collections != null && collections.size() > 0) {
String[] strings = (String[]) collections.toArray();
addParameter(filedName, strings);
return;
}
}
addParameter(filedName, invoke);
}
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
}
|
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