1、总览
2、代码
1）、pom.xml
这里注意：springboot 2.2.0以后默认的freemarker文件后缀为：ftlh。本例用的是2.2.1，所以后缀为ftlh
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency> <dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency> <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency> </dependencies>
2）、application.properties
#必须关闭whitelabel，否则无法导航到错误ftlh页面上
server.error.whitelabel.enabled=false
server.error.include-stacktrace=always
3）、java代码，与https://www.cnblogs.com/yaoyuan2/p/11873110.html一致
4）、5xx.ftlh
<!DOCTYPE html>
<html lang="en">
<head>
<style>
table td{
vertical-align:top;
border:solid 1px #888;
padding:10px;
}
</style>
</head>
<body>
<h1>My FreeMarker 5xx Error Page</h1>
<table>
<tr>
<td>Date</td>
<td>${timestamp?datetime}</td>
</tr>
<tr>
<td>Error</td>
<td>${error}</td>
</tr>
<tr>
<td>Status</td>
<td>${status}</td>
</tr>
<tr>
<td>Message</td>
<td>${message}</td>
</tr>
<tr>
<td>Exception</td>
<td>${exception!""}</td>
</tr>
<tr>
<td>Trace</td>
<td>
<pre>${trace}</pre>
</td>
</tr>
</table>
</body>
</html>
注意：在freemarker中${exception}是空的，导致出错，进而执行不到前模板页面了。因此，此处加上了!""，表示为空或找不到时为""。
5）、404.ftlh
<!DOCTYPE html>
<html lang="en">
<head>
<style>
table td{
vertical-align:top;
border:solid 1px #888;
padding:10px;
}
</style>
</head>
<body>
<h1>My FreeMarker 404 Error Page</h1>
<table>
<tr>
<td>Date</td>
<td>${timestamp?datetime}</td>
</tr>
<tr>
<td>Error</td>
<td>${error}</td>
</tr>
<tr>
<td>Status</td>
<td>${status}</td>
</tr>
<tr>
<td>Message</td>
<td>${message}</td>
</tr>
<tr>
<td>Exception</td>
<td>${exception!"No exception thrown"}</td>
</tr>
<tr>
<td>Trace</td>
<td>
<pre>${trace!"No Stacktrace available"}</pre>
</td>
</tr>
</table>
</body>
</html>
6）、error.ftlh
<!DOCTYPE html>
<html lang="en">
<head>
<style>
table td{
vertical-align:top;
border:solid 1px #888;
padding:10px;
}
</style>
</head>
<body>
<h1>My FreeMarker Custom Global Error Page</h1>
<table>
<tr>
<td>Date</td>
<td>${timestamp?datetime}</td>
</tr>
<tr>
<td>Error</td>
<td>${error}</td>
</tr>
<tr>
<td>Status</td>
<td>${status}</td>
</tr>
<tr>
<td>Message</td>
<td>${message}</td>
</tr>
<tr>
<td>Exception</td>
<td>${exception!"No exception"}</td>
</tr>
<tr>
<td>Trace</td>
<td>
<pre>${trace!"No trace"}</pre>
</td>
</tr>
</table>
</body>
</html>
3、执行
总结：
1、目录结构为：
templates
|_error.ftlh
|_error
|_5xx.ftlh
|_404.ftlh
2、application.properties中，必须加入：
server.error.whitelabel.enabled=false
如果想显示trace，也要加入：
server.error.include-stacktrace=always