【原因分析】
在同一个java文件，相同的字符串出现了多次。例如：
public String doAdd(HttpServletRequest request) {
String name = request.getParameter("name");
......
}
public String doUpdate(HttpServletRequest request) {
String newName = request.getParameter("name");
......
}
【影响分析】
重复的代码会增加维护难度，如果字符串内容变更了，则需要同时修改多处。
【修改建议】
将相同的字符串定义成一个常量。例如：
private static final String PARAM_NAME = "name";
public String doAdd(HttpServletRequest request) {
String name = request.getParameter(PARAM_NAME);
......
}
public String doUpdate(HttpServletRequest request) {
String newName = request.getParameter(PARAM_NAME);
......
}
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