我需要一个方法来提取有时可能包含“的值”

Question

package com.bml.icbs.ws.param;    
import java.util.HashMap;

公共类请求参数{

private String param;
private HashMap<String, String> hashmap;

    public RequestParameter(String param){

    this.param=param;
    this.hashmap = new HashMap<String, String>();

    Integer i; 
    String key,value;
    String myArray[] = this.param.split("&");


    for (i=0;i<myArray.length;i++){

        key=myArray[i].substring(0,myArray[i].indexOf("="));
        value=myArray[i].substring(myArray[i].indexOf("=")+1);
        this.hashmap.put(key,value);
    }
}

public String getParameterValue(String key){
    return this.hashmap.get(key);
}

public String getParam() {
    return param;
}

public void setParam(String param) {
    this.param = param;
}

public HashMap<String, String> getHashmap() {
    return hashmap;
}

public void setHashmap(HashMap<String, String> hashmap) {

    this.hashmap = hashmap;
}

}

当我在URL为“param2=ffffhhh”的情况下测试上述方法时

结果是：SIZE 5 URL参数2=ffffhhh

哪个是正确的

  public static void main(String[] args) {
    RequestParameter reqParam = new RequestParameter("param2=ffffhhh&param1=oooo&param3=pppp&param4=iiii&param5=kkkkk");
    System.out.println("SIZE " + reqParam.getHashmap().size());
    System.out.println("URL " + reqParam.getParam());
    System.out.println("HASHMAP " + reqParam.getHashmap());
    System.out.println("PARAM1 = " reqParam.getParameterValue("param1"));

}

但如果我将URL作为以下URL传递：“param2=ffff

public static void main(String[] args) {
    RequestParameter reqParam = new RequestParameter("param2=ffff&&&hhh=&param1=oooo=&&param3=pppp&param4=iiii&&yy=&param5=kkkkk");
    System.out.println("SIZE " + reqParam.getHashmap().size());
    System.out.println("URL " + reqParam.getParam());
    System.out.println("HASHMAP " + reqParam.getHashmap());
    System.out.println("PARAM1 = " reqParam.getParameterValue("param1"));

}

它引发以下异常：异常在线程"main"java.lang.StringIndexOutOfBoundsExcture：字符串索引超出范围：-1在java.lang.String.substring（String.java:1937）在com.bml.icbs.ws.param.请求参数。（arameter.java:188）在com.bml.icbs.ws.param.main.main（main.java： 9）




Answer 1

确保数组元素！埃米。

for (i=0;i<myArray.length;i++){
        if(myArray[i] == null || myArray[i].length()==0){
                continue;
        }
        key=myArray[i].substring(0,myArray[i].indexOf("="));
        value=myArray[i].substring(myArray[i].indexOf("=")+1);
        this.hashmap.put(key,value);
    }