//判断字符串是否为空
org.springframework.util.StringUtils.hasLength(str)
//判断集合框架list等是否为空
org.springframework.util.CollectionUtils.isEmpty(collection)
//把list转化为逗号隔开的字符串
public static final String DEFAULT_LIST_DELIMTER = ",";
public static String getStringByList(List<? extends Object> list) {
return getStringByList(list, DEFAULT_LIST_DELIMTER);
}
public static String getStringByList(List<? extends Object> list, String delimter) {
StringBuffer sb = new StringBuffer();
if (! CollectionUtils.isEmpty(list)) {
for (int i = 0 ; i < list.size(); i++) {
sb.append(list.get(i).toString() + (i == (list.size() - 1) ? "" : delimter));
}
}
return sb.toString();
}
//String类型转化为Int型通用方法
public static Integer convertStringToInt(String str) {
return convertStringToInt(str, 0);
}
public static Integer convertStringToInt(String str, Integer defaultValue) {
if (! org.springframework.util.StringUtils.hasLength(str)) {
return defaultValue;
}
try {
return Integer.parseInt(str.trim());
} catch (Exception ex) {
log.error("exception in convertStringToInt orignal value=" + str);
return defaultValue;
}
}
//logger定义
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
private static final Logger logger = LoggerFactory.getLogger(xxxx.class);
//常量定义
public interface familyConstants {
String ERROR_RESULT_TEMPALTE = "{\"result\":\"0\",\"resultText\":\"%s\"}";
String SUCCESS_RESULT_TEMPALTE = "{\"result\":\"1\",\"resultText\":\"%s\"}";
String OPERATE_SUCCESS = "operate.success";
String OPERATE_ERROR = "operate.error";
String PARAMETER_NOT_FOUND = "parameter.not.found";
}
//PropertiesContainer
定义
public class PropertiesContainer {
public static Properties properties=null;
public static String get(String key) {
if(properties!=null){
String value=properties.getProperty(key);
if(StringUtils.isNotBlank(value)) {
return value;
} else{
log.error("未定义key为["+key+"]的properties");
return null;
}
} else{
return null;
}
}
}
使用：PropertiesContainer.get(key);
//String.format
定义方法
public static String format(String format, Object... args) {
return new Formatter().format(format, args).toString();
}
使用
String.format(format, args);
String.format(constants.ERROR_RESULT_TEMPALTE,
PropertiesContainer.get(constants.PARAMETER_NOT_FOUND))