如何用Java中的值替换特定的字符串

Question

EDIT :

Goal : http://localhost:8080/api/upload/form/test/test

Is it possible to have some thing like `{a-b, A-B..0-9}` kind of pattern and match them and replace with value.

i have following string

http://localhost:8080/api/upload/form/{uploadType}/{uploadName}

there can be any no of strings like {uploadType}/{uploadName} .

how to replace them with some values in java?

Answer 1

[Edited] Apparently you don't know what substitutions you'll be looking for, or don't have a reasonable finite Map of them. In this case:

Pattern SUBST_Patt = Pattern.compile("\\{(\\w+)\\}");
StringBuilder sb = new StringBuilder( template);
Matcher m = SUBST_Patt.matcher( sb);
int index = 0;
while (m.find( index)) {
    String subst = m.group( 1);
    index = m.start();
    //
    String replacement = "replacement";       // .. lookup Subst -> Replacement here
    sb.replace( index, m.end(), replacement);
    index = index + replacement.length();
}

Look, I'm really expecting a +1 now.

---

[Simpler approach] String.replace() is a 'simple replace' & easy to use for your purposes; if you want regexes you can use String.replaceAll() .

For multiple dynamic replacements:

public String substituteStr (String template, Map<String,String> substs) {
    String result = template;
    for (Map.Entry<String,String> subst : substs.entrySet()) {
        String pattern = "{"+subst.getKey()+"}";
        result = result.replace( pattern, subst.getValue());
    }
    return result;
}

That's the quick & easy approach, to start with.

Answer 2

You can use the replace method in the following way:

    String s = "http://localhost:8080/api/upload/form/{uploadType}/{uploadName}";
    String typevalue = "typeValue";
    String nameValue = "nameValue";
    s = s.replace("{uploadType}",value).replace("{uploadName}",nameValue);

Answer 3

You can take the string that start from {uploadType} till the end. Then you can split that string using "split" into string array. Were the first cell(0) is the type and 1 is the name.

Answer 4

String s = "http://localhost:8080/api/upload/form/{uploadType}/{uploadName}";
String result = s.replace("uploadType", "UploadedType").replace("uploadName","UploadedName");

EDIT: Try this:

String r = s.substring(0 , s.indexOf("{")) + "replacement";

Answer 5

Solution 1 :

String uploadName = "xyz";
String url = "http://localhost:8080/api/upload/form/" + uploadName;

Solution 2:

String uploadName  = "xyz";
String url = "http://localhost:8080/api/upload/form/{uploadName}";
url.replace("{uploadName}",uploadName );

Solution 3:

String uploadName  = "xyz";
String url = String.format("http://localhost:8080/api/upload/form/ %s ", uploadName);

Answer 6

The UriBuilder does exactly what you need:

UriBuilder.fromPath("http://localhost:8080/api/upload/form/{uploadType}/{uploadName}").build("foo", "bar");

Results in:

http://localhost:8080/api/upload/form/foo/bar