import java.text.DecimalFormat;public class Test{ private int num=1;  private int count=7;  public void test() {  DecimalFormat df = new DecimalFormat("0.00");    String str=df.f

public class HttpUrlClient { private static final int CONNECTION_TIMEOUT = 20000; private static final String CHARCODE="UTF-8"; public HttpUrlClient() { } /** * Using GET method. * *

造成这种过错是ni的支撑Tomcat运行的JDK版本与支撑application运行的JDK版本不一致导致的.把它们的JDK版本改成一致步骤如下:1.Window --> Preferences -->Java --> compiler中的compiler compliance level对应的下拉菜单中选择JDK版本.2.Window --> Preferences -->MyEcl

1. 验证是否是数字

public class RequestUtils{ public static String escapeHtmlString(String input) {  if (input == null || input.length() == 0)   return "";  char c;  StringBuffer sb = new StringBuffer(

java spring mvc @ResponseBody返回json数据报错

import javax.persistence.Entity;导入报错，是因为缺少了一个jar包

1. 读取Properties文件    ResourceBundle rb = ResourceBundle.getBundle("conf.config");    String imgHostUrl =rb.getString("imgHostUrl").trim();

1. 获取表单的值

字符串判断： 例1: 判断是否为空(blank):StringUtils.isBlank(null): trueStringUtils.isBlank(""): trueStringUtils.isBlank(" "): true例2: 判断是否不为空(blank):StringUtils.isNotBlank(null): falseStringUtils

集合判断： 例1: 判断集合是否为空:CollectionUtils.isEmpty(null): trueCollectionUtils.isEmpty(new ArrayList()): trueCollectionUtils.isEmpty({a,b}): false例2: 判断集合是否不为空:CollectionUtils.isNotEmpty(null

1. 表单

实体实体引用含义lt<gt>>（大于号）amp&&（“and”符）apos&apos;'（撇号或单引号）quot""（双引号）

下载了hibernate-distribution-3.3.1.GA-dist集成到web工程中,运行tomcat服务器,其中报错: Failed to load class "org.slf4j.impl.StaticLoggerBinder". 详细信息如下: =============================================================

// 方法一：SpringJUnit4测试@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations ={ "../spring/spring_core.xml", "../spring/spring_service.xml", "../spring/spring_qsecurity.xml", "../