中文随机数

import java.util.Random;

public class Random_str {
public static String RandomJianHan(int len) {
String ret = "";
for (int i = 0; i < len; i++) {
String str = null;
int hightPos, lowPos; // 定义高低位
Random random = new Random();
hightPos = (176 + Math.abs(random.nextInt(39))); // 获取高位值
lowPos = (161 + Math.abs(random.nextInt(93))); // 获取低位值
byte[] b = new byte[2];
b[0] = (new Integer(hightPos).byteValue());
b[1] = (new Integer(lowPos).byteValue());
try {
str = new String(b, "GBk"); // 转成中文
} catch (UnsupportedEncodingException ex) {
ex.printStackTrace();
}
ret += str;
}
return ret;
}
}

Random_str ran = new Random_str();
String content1 =  ran.RandomJianHan(50); //此处生成的是长度为50的字符串
vars.put("content_post",content1);//输出的变量名称