我一直在 Internet 上搜索可以让我解析 UNIX/etc/group 文件的 Java 包/类。虽然从头开始写这个真的不难,但我很惊讶没有找到已经存在的东西。有一个 POSIX passwd 类(请参阅 http://www.bmsi.com/java/posix/docs/posix.Passwd.html ),但我没有为/etc/group 找到类似的类。有这种东西吗?
最佳答案
这是我再次更新的 tofubeer 更新的代码。他没有编译。缺少 InvalidGroupException 类。此外,没有指定包。将 EMPTY_LIST 切换为 emptyList() 以避免缺少参数化。
package fileutils;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
public class GroupReader2 {
public static class InvalidGroupException extends Exception {
private static final long serialVersionUID = 1L;
public InvalidGroupException(String string) {
super(string);
}
}
public static GroupReader2 parseGroup(final String groupLine)
throws InvalidGroupException {
final String line;
final String[] parts;
if (groupLine == null) {
throw new IllegalArgumentException("groupLine cannot be null");
}
line = groupLine.trim();
if (line.startsWith("#") || line.isEmpty()) {
return null;
}
parts = line.split(":");
if (parts.length < 3) {
throw new InvalidGroupException(groupLine
+ "must be in the format of name:passwd:gid[:userlist]");
}
try {
final GroupReader2 group;
final String name;
final String passwd;
final int gid;
final List<String> userList;
name = parts[0];
passwd = parts[1];
gid = Integer.parseInt(parts[2]);
if (parts.length == 4) {
userList = Arrays.asList(parts[3].split(","));
} else {
userList = Collections.emptyList();
}
group = new GroupReader2(name, passwd, gid, userList);
return group;
} catch (final NumberFormatException ex) {
throw new InvalidGroupException(groupLine + " gid must be a number");
}
}
private final int gid;
private final String name;
private final String passwd;
private final List<String> userList;
public GroupReader2(final String nm, final String pw, final int id,
final List<String> users) {
name = nm;
passwd = pw;
gid = id;
userList = Collections.unmodifiableList(new ArrayList<String>(users));
}
public int getGid() {
return (gid);
}
public String getName() {
return (name);
}
public String getPasswd() {
return (passwd);
}
public List<String> getUserList() {
return (userList);
}
@Override
public String toString() {
final StringBuilder sb;
sb = new StringBuilder();
sb.append(name);
sb.append(":");
sb.append(passwd);
sb.append(":");
sb.append(gid);
sb.append(":");
for (final String user : userList) {
sb.append(user);
sb.append(",");
}
sb.setLength(sb.length() - 1);
return (sb.toString());
}
}
关于java - 有没有读取UNIX/etc/group文件的Java包?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/617165/