在Java中拆分字符串的有效方法

时间：2019-04-24 09:54:50

标签： java string split

我有一些像这种模式的输入：

  

org.apache.felix.dm; version =“ [4.1,5）”，org.osgi.framework; version =“ [1.5,2）”，org.osgi.service.cm; version =“ [1.3 ，2）“，org.osgi.service.deploymentadmin; version =” [1.0,2）“，org.osgi.service.deploymentadmin.spi; version =” [1.0,2）“，org.osgi.service.event ; version =“ [1.2,2）”，org.osgi.service.log; version =“ [1.3,2）”，org.osgi.service.metatype; version =“ [1.3,2）”，org.osgi .util.tracker; version =“ [1.4,2）”

我需要将其拆分并存储在这样的对象或列表中：

  • 对象1： 

    String name = "org.apache.felix.dm";
String[] versions = {4.1.0, 5.0.0}

  • 对象2： 

    String name = "org.osgi.framework";
String[] versions = {1.5.0, 2.0.0}

2 个答案:

答案 0 :(得分：0)

我将分三步解决

步骤1：

将名称和版本成对分割。所以你最终会得到

org.apache.felix.dm;version="[4.1,5)"
org.osgi.framework;version="[1.5,2)"
org.osgi.service.cm;version="[1.3,2)"
org.osgi.service.deploymentadmin;version="[1.0,2)"
org.osgi.service.deploymentadmin.spi;version="[1.0,2)"
org.osgi.service.event;version="[1.2,2)"
org.osgi.service.log;version="[1.3,2)"
org.osgi.service.metatype;version="[1.3,2)"
org.osgi.util.tracker;version="[1.4,2)"

为此，您可以执行以下操作：

String text = "org.apache.felix.dm;version=\"[4.1,5)\",org.osgi.framework;version=\"[1.5,2)\",org.osgi.service.cm;version=\"[1.3,2)\",org.osgi.service.deploymentadmin;version=\"[1.0,2)\",org.osgi.service.deploymentadmin.spi;version=\"[1.0,2)\",org.osgi.service.event;version=\"[1.2,2)\",org.osgi.service.log;version=\"[1.3,2)\",org.osgi.service.metatype;version=\"[1.3,2)\",org.osgi.util.tracker;version=\"[1.4,2)\"";
    String[] strArray = text.split(",(?=([^\"]*\"[^\"]*\")*[^\"]*$)");

strArray现在包含对。

做

for (String string : strArray) {
    System.out.println(string);
}

打印

org.apache.felix.dm;version="[4.1,5)"
org.osgi.framework;version="[1.5,2)"
org.osgi.service.cm;version="[1.3,2)"
org.osgi.service.deploymentadmin;version="[1.0,2)"
org.osgi.service.deploymentadmin.spi;version="[1.0,2)"
org.osgi.service.event;version="[1.2,2)"
org.osgi.service.log;version="[1.3,2)"
org.osgi.service.metatype;version="[1.3,2)"
org.osgi.util.tracker;version="[1.4,2)"

第2步：

为strArray中的每个条目创建一个对象并将它们存储在数组或列表中（这次选择ArrayList，您可以选择想要的任何内容）：

    String text = "org.apache.felix.dm;version=\"[4.1,5)\",org.osgi.framework;version=\"[1.5,2)\",org.osgi.service.cm;version=\"[1.3,2)\",org.osgi.service.deploymentadmin;version=\"[1.0,2)\",org.osgi.service.deploymentadmin.spi;version=\"[1.0,2)\",org.osgi.service.event;version=\"[1.2,2)\",org.osgi.service.log;version=\"[1.3,2)\",org.osgi.service.metatype;version=\"[1.3,2)\",org.osgi.util.tracker;version=\"[1.4,2)\"";
    String[] strArray = text.split(",(?=([^\"]*\"[^\"]*\")*[^\"]*$)");  
    ArrayList<MyObject> list = new ArrayList<>();
    for (String string : strArray) {
        String currentPair[] = string.split(";");
        list.add(new MyObject(currentPair[0], currentPair[1]
                .replaceAll("\"", "")
                .replaceAll("version=", "")
                .replaceAll("\\[", "")
                .replaceAll("\\)", "").split(",")));
    }

    for (MyObject myObject : list) {
        System.out.print("Name: " + myObject.name + " - Versions:");
        for (String version : myObject.versions) {
            System.out.print(version + " ");
        }
        System.out.println();
    }

MyObject成为对象的类。

打印以下内容：

Name: org.apache.felix.dm - Versions:4.1 5 
Name: org.osgi.framework - Versions:1.5 2 
Name: org.osgi.service.cm - Versions:1.3 2 
Name: org.osgi.service.deploymentadmin - Versions:1.0 2 
Name: org.osgi.service.deploymentadmin.spi - Versions:1.0 2 
Name: org.osgi.service.event - Versions:1.2 2 
Name: org.osgi.service.log - Versions:1.3 2 
Name: org.osgi.service.metatype - Versions:1.3 2 
Name: org.osgi.util.tracker - Versions:1.4 2

现在这几乎是您想要的，仅剩下的事情就是将版本号格式化为3个点。

第3步：将版本字符串的格式设置为3点：

为此，我编写了一个方法，并将currentpair [1] ...作为参数

public static void main(String[] args) {
    String text = "org.apache.felix.dm;version=\"[4.1,5)\",org.osgi.framework;version=\"[1.5,2)\",org.osgi.service.cm;version=\"[1.3,2)\",org.osgi.service.deploymentadmin;version=\"[1.0,2)\",org.osgi.service.deploymentadmin.spi;version=\"[1.0,2)\",org.osgi.service.event;version=\"[1.2,2)\",org.osgi.service.log;version=\"[1.3,2)\",org.osgi.service.metatype;version=\"[1.3,2)\",org.osgi.util.tracker;version=\"[1.4,2)\"";
    String[] strArray = text.split(",(?=([^\"]*\"[^\"]*\")*[^\"]*$)");
    ArrayList<MyObject> list = new ArrayList<>();
    for (String string : strArray) {
        String currentPair[] = string.split(";");
        list.add(new MyObject(currentPair[0], addDots(currentPair[1]
                .replaceAll("\"", "")
                .replaceAll("version=", "")
                .replaceAll("\\[", "")
                .replaceAll("\\)", "").split(","), 3)));
    }

    for (MyObject myObject : list) {
        System.out.print("Name: " + myObject.name + " - Versions:");
        for (String version : myObject.versions) {
            System.out.print(version + " ");
        }
        System.out.println();
    }
}

public static String[] addDots(String toAdd[], int dotcount) {
    String[] formattedVersions = new String[toAdd.length];
    for (int i = 0; i < toAdd.length; i++) {
        ArrayList<String> digits = new ArrayList<>();
        digits.add(toAdd[i]);
        if(toAdd[i].contains(".")) {
            digits = new ArrayList<>(Arrays.asList(toAdd[i].split("\\.")));
        }
        for(int x = digits.size(); x < dotcount; x++) {
            digits.add("0");
        }
        String curretnFormattedVersion = "";
        for (int j = 0; j < digits.size() - 1; j++) {
            curretnFormattedVersion += digits.get(j) + ".";
        }
        curretnFormattedVersion += digits.get(dotcount - 1);
        formattedVersions[i] = curretnFormattedVersion;
    }
    return formattedVersions;
}

现在将打印以下内容：

Name: org.apache.felix.dm - Versions: 4.1.0 5.0.0 
Name: org.osgi.framework - Versions: 1.5.0 2.0.0 
Name: org.osgi.service.cm - Versions: 1.3.0 2.0.0 
Name: org.osgi.service.deploymentadmin - Versions: 1.0.0 2.0.0 
Name: org.osgi.service.deploymentadmin.spi - Versions: 1.0.0 2.0.0 
Name: org.osgi.service.event - Versions: 1.2.0 2.0.0 
Name: org.osgi.service.log - Versions: 1.3.0 2.0.0 
Name: org.osgi.service.metatype - Versions: 1.3.0 2.0.0 
Name: org.osgi.util.tracker - Versions: 1.4.0 2.0.0

这应该正是您所需要的。

我不能说这是否有效，但是从代码的长度来看，我会说“不，但是，嘿，它的工作原理：D

答案 1 :(得分：0)

只需使用此代码，此代码取决于您在Question中输入的字符串

package com.java;

public class Test {

public static void main( String[] args ) {

    String inputString = Test.getString();

    String[] firstSplit = inputString.split("\",");
    int counter = 1;

    for (String firstString : firstSplit) {

        String[] secondSplit = firstString.split(";"); 

        for(String secondString : secondSplit) {                

            if(secondString.substring(0,1).equals("o")) {
                System.out.println("Object" + counter++);
                String name = secondString;
                System.out.println("name = " + name);
            }
            if(secondString.substring(0,7).equals("version")) {
                String[] versions = new String[2];
                versions[0] = secondString.substring(10,13) + ".0";
                versions[1] = secondString.substring(14,15) + ".0.0";
                System.out.println("Version = " + versions[0] + ", " + versions[1]);
            }

        }


    }
}


static String getString() {
    return "org.apache.felix.dm;version=\"[4.1,5)\",org.osgi.framework;version=\"[1.5,2)\",org.osgi.service.cm;version=\"[1.3,2)\",org.osgi.service.deploymentadmin;version=\"[1.0,2)\",org.osgi.service.deploymentadmin.spi;version=\"[1.0,2)\",org.osgi.service.event;version=\"[1.2,2)\",org.osgi.service.log;version=\"[1.3,2)\",org.osgi.service.metatype;version=\"[1.3,2)\",org.osgi.util.tracker;version=\"[1.4,2)\"";
}

}

结果将是

Object1
name = org.apache.felix.dm
Version = 4.1.0, 5.0.0
Object2
name = org.osgi.framework
Version = 1.5.0, 2.0.0
Object3
name = org.osgi.service.cm
Version = 1.3.0, 2.0.0
Object4
name = org.osgi.service.deploymentadmin
Version = 1.0.0, 2.0.0
Object5
name = org.osgi.service.deploymentadmin.spi
Version = 1.0.0, 2.0.0
Object6
name = org.osgi.service.event
Version = 1.2.0, 2.0.0
Object7
name = org.osgi.service.log
Version = 1.3.0, 2.0.0
Object8
name = org.osgi.service.metatype
Version = 1.3.0, 2.0.0
Object9
name = org.osgi.util.tracker
Version = 1.4.0, 2.0.0
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