java截取逗号后字符 java 截取字符串第一个字符
java\u5982\u4f55\u53d6\u5230\u6700\u540e\u4e00\u4e2a\u9017\u53f7\u540e\u9762\u7684\u5b57\u7b26String test="abc,efg,hij";
int one = test.lastIndexOf(",");
System.out.println(test.substring((one+1),test.length()));
//\u8fd9\u6837\u5c31\u53ef\u4ee5\u4e86\uff0c\u53ea\u4f1a\u6253\u5370 hij \u6700\u540e\u4e00\u4e2a\u9017\u53f7\u524d\u7684\u90fd\u4e0d\u6253\u5370 \u4eb2\u6d4b\uff0c\u4f60\u8bd5\u8bd5\u5475\u5475
\u4f7f\u7528substring() \u65b9\u6cd5\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u5b50\u5b57\u7b26\u4e32\u3002\u8be6\u7ec6\u89e3\u6790\u5982\u4e0b\uff1a
1\u3001\u8bed\u6cd5\uff1a
\uff081\uff09public String substring(int beginIndex)\u3002
\uff082\uff09public String substring(int beginIndex, int endIndex)\u3002
2\u3001\u53c2\u6570\uff1a
\uff081\uff09beginIndex -- \u8d77\u59cb\u7d22\u5f15\uff08\u5305\u62ec\uff09, \u7d22\u5f15\u4ece 0 \u5f00\u59cb\u3002
\uff082\uff09endIndex -- \u7ed3\u675f\u7d22\u5f15\uff08\u4e0d\u5305\u62ec\uff09\u3002
3\u3001\u8fd4\u56de\u503c\uff1a
\u8fd4\u56de\u4e00\u4e2a\u65b0\u5b57\u7b26\u4e32\uff0c\u5b83\u662f\u6b64\u5b57\u7b26\u4e32\u7684\u4e00\u4e2a\u5b50\u5b57\u7b26\u4e32\u3002\u8be5\u5b50\u5b57\u7b26\u4e32\u4ece\u6307\u5b9a\u7684 beginIndex \u5904\u5f00\u59cb\uff0c\u4e00\u76f4\u5230\u7d22\u5f15 endIndex - 1\u5904\u7684\u5b57\u7b26\u3002\u56e0\u6b64\uff0c\u8be5\u5b50\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u4e3a endIndex-beginIndex\u3002
4\u3001substring\u51fd\u6570\u5b58\u5728\u7684\u629b\u51fa\u9519\u8bef\uff1a
IndexOutOfBoundsException - \u5982\u679c beginIndex \u4e3a\u8d1f\uff0c\u6216 endIndex \u5927\u4e8e\u6b64 String \u5bf9\u8c61\u7684\u957f\u5ea6\uff0c\u6216 beginIndex \u5927\u4e8e endIndex\u3002
5\u3001\u5b9e\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a
\u4ee5\u4e0a\u7a0b\u5e8f\u6267\u884c\u7ed3\u679c\u4e3a\uff1a
\u6269\u5c55\u8d44\u6599\uff1a
\u901a\u8fc7split()+\u6b63\u5219\u8868\u8fbe\u5f0f\u6765\u8fdb\u884c\u5b57\u7b26\u4e32\u622a\u53d6\uff1a
\u5c06\u6b63\u5219\u4f20\u5165split()\u3002\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\u7c7b\u578b\u3002\u4e0d\u8fc7\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\u622a\u53d6\u4f1a\u6709\u5f88\u5927\u7684\u6027\u80fd\u635f\u8017\uff0c\u56e0\u4e3a\u5206\u6790\u6b63\u5219\u975e\u5e38\u8017\u65f6\u3002
\u4f8b\u5982\uff1a
\u8fd0\u884c\u7ed3\u679c\uff1a
\u53c2\u8003\u8d44\u6599\uff1a
\u767e\u5ea6\u767e\u79d1--substring
可以通过java的indexOf方法获取到逗号的位置，之后通过”substring“方法截取出对应的字符串。举例：
String reqResult = "11111111111111,222222222222";
String getSignInfo = reqResult.substring(reqResult.indexOf(",") + 1);//获取开始截取的位置，之后截取逗号后面的所有内容
System.out.print(getSignInfo);
输出结果：222222222222。
据题意，粗略为楼主写了下程序，请看：
public class Division{
public static void main(String [] args){
String str = new String ("1,2,3,4,5,6");
String[] str1 = str.split(",");
System.out.println(str1[2]);//选择第3个元素
}
}
FileInputStream in = null;
try {
in = new FileInputStream("d:\\share\\java\\io\\TestFileInputStream.java");// 你的路径。
} catch (FileNotFoundException e) {
System.out.println("找不到指定文件");
System.exit(-1);
}
while((b=in.read())!=-1){ // 再把文件内容读出来
String s = "1,2,3,4,5,6";
String[] num = s.split(",");
num[3-1]应该就是你要的了
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