java - Java中分割字符串的有效方法

Question

我有一些像这样的模式的输入:

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)"

我需要将其拆分并将其存储在对象或列表中，如下所示:

• 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}
  

Answer 1

我会分三步解决这个问题

第 1 步:

将文本分成名称和版本对。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 现在包含这些对。

正在做

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(我这次选择 ArrayList，你可以选择任何你想要的):

    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 是您对象的类。

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 

现在这几乎就是您想要的，唯一剩下的就是将版本号格式化为 3 个点。

第 3 步:将版本字符串格式化为 3 个点:

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。

我无法判断这是否有效，但从代码的长度来看，我会说不，但是嘿，它的工作原理:D