本篇内容主要讲解“JAVA怎么删除字符串固定下标字串”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“JAVA怎么删除字符串固定下标字串”吧!
需要修改的报文
当你拿到的报文是这样的
{
"input": {
"sdfsn": "23u4209350-2",
"fsfs": "128412094",
"sgsgsg": "15821059",
"inssgsuplc_admdfdfdvs": "125125332",
"dgh": "125215312",
"dfgdfg": "215215",
"sdhdsh": "",
"sdfsn": "",
"shdfshdshdsh": "shsdh",
"sdhdsh": "shsh.0",
"shsdhsd": "1",
"shsdh": "1607",
"input": {
"data": {
"dhfsdhsd": "235325",
"shsdhsdh": "03",
"dgd": "BE0445360",
"dfhfdh": "11",
"dshshsd": 76.56,
"ghjrfgj": "01",
"grjf": "234623626",
"hjfd": "236436",
"djfdfgjdfj": "45634",
"exp_Content": "{"gdsg":"01","gjfj":"658568","fjfj":"5675467","ghfjfgkj":"68568","vmgfvj":"658568","gfhjgfyk":"0","fghkfghkg":"5474567"}",
"dfjgdfj": "",
"dfjdfjgdfj": "56745745",
"dfgjdfgjh": 45756758,
"jdfgjhfdgj": 0,
}
}
},
"output": {
"output": {
"r757": {
"dhfsdhsd": "235325",
"shsdhsdh": "03",
"dgd": "BE0445360",
"dfhfdh": "11",
"dshshsd": 76.56,
"ghjrfgj": "01",
"grjf": "234623626",
"hjfd": "236436",
"djfdfgjdfj": "45634",
"exp_content": "",
"dfjgdfj": "",
"dfjdfjgdfj": "56745745",
"dfgjdfgjh": 45756758,
"jdfgjhfdgj": 0,
},
"sdfgsdfg": [
{
"sgasgag": "4673476",
"agasgdas": 5675467,
"asgasgasg": "",
"asdgasgas": 4567456754,
"dhsdsxchsdh": 54675467,
"sdfhsdhsdh": "5674756457"
}
]
},
"erherth": 0,
}
}这一看就知道上边的报文在postman里边肯定会报错，因为exp_Content，因此他又没有用到，所以你想把他删掉。其实也没那么难删
也就是用到了流转字符串。字符串固定字符查找，然后进行字符串转字符流，删掉字符流中固定字符，之后再转回来。因为字符串已经是final了所以很多用法都是使用字符串转字符流实现的
实现代码如下
private JSONObject resolveApplicationJson(HttpServletRequest request) {
InputStream is = null;
String json = null;
try {
is = request.getInputStream();
json = IOUtils.toString(is, "UTF-8");
json=json.replaceAll("
|
| ","");
int index= json.indexOf("exp_Content");
int indexfirst=json.indexOf("{", index);
int indexlast=json.indexOf("}",index);
if (index!=-1 && indexlast !=-1 &&indexfirst !=-1) {
StringBuffer stringBuffer = new StringBuffer(json);
stringBuffer.delete(indexfirst,indexlast+1);
json=stringBuffer.toString();
}
} catch (IOException e) {
throw new RuntimeException("CANNOT get reader from request!", e);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
try {
return new JSONObject(json);
} catch (JSONException e) {
throw new RuntimeException("CANOT CONVET JSON:[" + json + "] to JSONObject!", e);
}
}多存在多个不符合规定的数据然后你要删掉怎么操作呢？
当你拿到的报文是这样的。
{
"input": {
"sdfsn": "23u4209350-2",
"fsfs": "128412094",
"sgsgsg": "15821059",
"inssgsuplc_admdfdfdvs": "125125332",
"dgh": "125215312",
"dfgdfg": "215215",
"sdhdsh": "",
"sdfsn": "",
"shdfshdshdsh": "shsdh",
"sdhdsh": "shsh.0",
"shsdhsd": "1",
"shsdh": "1607",
"input": {
"data": {
"dhfsdhsd": "235325",
"shsdhsdh": "03",
"dgd": "BE0445360",
"dfhfdh": "11",
"dshshsd": 76.56,
"ghjrfgj": "01",
"grjf": "234623626",
"hjfd": "236436",
"djfdfgjdfj": "45634",
"exp_Content": "{"gdsg":"01","gjfj":"658568","fjfj":"5675467","ghfjfgkj":"68568","vmgfvj":"658568","gfhjgfyk":"0","fghkfghkg":"5474567"}",
"dfjgdfj": "",
"dfjdfjgdfj": "56745745",
"dfgjdfgjh": 45756758,
"jdfgjhfdgj": 0,
}
}
},
"output": {
"output": {
"r757": {
"dhfsdhsd": "235325",
"shsdhsdh": "03",
"dgd": "BE0445360",
"exp_Content": "{"gdsg":"01","gjfj":"658568","fjfj":"5675467","ghfjfgkj":"68568","vmgfvj":"658568","gfhjgfyk":"0","fghkfghkg":"5474567"}",
"dfhfdh": "11",
"dshshsd": 76.56,
"ghjrfgj": "01",
"grjf": "234623626",
"hjfd": "236436",
"djfdfgjdfj": "45634",
"exp_content": "{"gdsg":"01","gjfj":"658568","fjfj":"5675467","ghfjfgkj":"68568","vmgfvj":"658568","gfhjgfyk":"0","fghkfghkg":"5474567"}",
"dfjgdfj": "",
"dfjdfjgdfj": "56745745",
"dfgjdfgjh": 45756758,
"jdfgjhfdgj": 0,
},
"sdfgsdfg": [
{
"sgasgag": "4673476",
"agasgdas": 5675467,
"asgasgasg": "",
"asdgasgas": 4567456754,
"dhsdsxchsdh": 54675467,
"sdfhsdhsdh": "5674756457"
}
]
},
"erherth": 0,
}
}解决方式如下：根据需要写出正则表达式，再使用正则看看有几个这样的不需要的符号，然后循环遍历几次，之后找到这部分，最后删除掉。
实现代码如下
# 全局变量
private static String REGEX = "exp_[c,C]ontent";
# 方式方法
Pattern p = Pattern.compile(REGEX);
// 获取 matcher 对象
Matcher m = p.matcher(JSON);
List<Integer> list = new ArrayList();
while(m.find()){
list.add(m.start());
}
int index=0;
int indexfirst=0;
int indexlast=0;
for (int j = 0; j < list.size(); j++) {
index=JSON.indexOf("exp_",indexlast);
indexfirst=JSON.indexOf("{", index);
indexlast=JSON.indexOf("}",index);
StringBuffer stringBuffer =null;
if (indexlast !=-1 &&indexfirst !=-1) {
stringBuffer = new StringBuffer(JSON);
stringBuffer.delete(indexfirst,indexlast+1);
}
JSON=stringBuffer.toString();
}