Severlet提取表单信息中文乱码

jsp代码：

<form action="SeverletArticle?op=updateArticle" method="post">
						<table border="" cellspacing="" cellpadding=""
							class="table table-striped table-hover ">
							<tr>
								<th>文章编号</th>
								<th>文章标题</th>
								<th>文章内容</th>
								<th>发表日期</th>
								<th>作者编号</th>
							</tr>
							<tr class="gradeD">
								<td><input type="text" id="id" name="id" readonly="readonly" class="form-control" /></td>
								<td><input type="text" id="title" name="title" class="form-control"/></td>
								<td><input type="text" id="articleContent"
									name="articleContent" class="form-control"/></td>
								<td class="center"><input type="text" id="date" name="date" class="form-control"/></td>
								<td class="center"><input type="text" id="authorId"
									name="authorId" class="form-control"/></td>
							</tr>
						</table>
                        <input type="submit" class="btn btn-secondary"  value="修改"></input>
					</form>

解决办法：在service层加这行代码，如果没有service层就在第一次出现request变量的方法里面加

request.setCharacterEncoding("utf-8");

示例：

	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding("utf-8");
		if (request.getParameter("op")==null) {
			doGet(request, response);
		}else if ("deleteArticle".equals(request.getParameter("op"))) {
			doDelete(request, response);
		}else if ("updateArticle".equals(request.getParameter("op"))) {
			doUpdate(request, response);
		}
		
	}