Thymeleaf 迭代,if,switch语法

1、Thymeleaf 目标

1. 迭代语法：th:each; iteration status
2. 条件语法：th:if; th:unless
3. switch语法：th:switch; th:case; *

2、公共模拟SpringBoot 后台接口

后台逻辑（action）

// 分页查询
	@RequestMapping("/allColumnValidates")
	public String getPage(Model model, @RequestParam(defaultValue = "1") int pageNo,
			@RequestParam(defaultValue = "10") int pageSize) {
		// 注意:分页代码PageHelper.startPage(pageNo,pageSize);只对其后的第一个查询有效。
		PageHelper.startPage(pageNo, pageSize);
		List<ColumnValidate> list = service.selectAll();

		PageInfo pageInfo = new PageInfo(list);
		model.addAttribute("pageInfo", pageInfo);
		// 获得当前页
		model.addAttribute("pageNum", pageInfo.getPageNum());
		// 获得一页显示的条数
		model.addAttribute("pageSize", pageInfo.getPageSize());
		// 是否是第一页
		model.addAttribute("isFirstPage", pageInfo.isIsFirstPage());
		// 获得总页数
		model.addAttribute("totalPages", pageInfo.getPages());
		// 是否是最后一页
		model.addAttribute("isLastPage", pageInfo.isIsLastPage());

		return "validate/validate";
	}

	// 跳转至新增页面
	@RequestMapping(value = "/insertPage", method = { RequestMethod.GET })
	public String insertPage() {
		return "validate/add";
	}

	// 插入
	@RequestMapping(value = "/insert", method = { RequestMethod.POST })
	public String insert(ColumnValidate entity) {
		IdGenerator idWorker = new IdGenerator(0,0);
		String sid = String.valueOf(idWorker.nextId());
		entity.setSid(sid);
		// 默认始化值
		entity.setCreateDt(new Date());
		entity.setDeleteFlag(GlobalConstant.DELETE_FLAG_NO);
		entity.setState(GlobalConstant.ENABLE);
		entity.setVersion(GlobalConstant.DEFAULT_VALUE);
		service.insert(entity);
		// 字段验证规则新增成功，调整至字段验证首页
		return "redirect:/api/column-validate/allColumnValidates";
	}

实体对象:

package com.zzg.entity;

import java.util.Date;

import org.springframework.format.annotation.DateTimeFormat;

import com.zzg.common.core.model.BaseEntity;

public class ColumnValidate extends BaseEntity {
	private String sid;

	private String createBy;

	private Date createDt;

	private String updateBy;

	private Date updateDt;

	private Integer version;

	private String validateName;

	private String validateContent;

	private String state;

	private String deleteFlag;

	private static final long serialVersionUID = 1L;

	public String getSid() {
		return sid;
	}

	public void setSid(String sid) {
		this.sid = sid == null ? null : sid.trim();
	}

	public String getCreateBy() {
		return createBy;
	}

	public void setCreateBy(String createBy) {
		this.createBy = createBy == null ? null : createBy.trim();
	}

	@DateTimeFormat(pattern = "dd-MMM-YYYY")
	public Date getCreateDt() {
		return createDt;
	}

	public void setCreateDt(Date createDt) {
		this.createDt = createDt;
	}

	@DateTimeFormat(pattern = "dd-MMM-YYYY")
	public String getUpdateBy() {
		return updateBy;
	}

	public void setUpdateBy(String updateBy) {
		this.updateBy = updateBy == null ? null : updateBy.trim();
	}

	public Date getUpdateDt() {
		return updateDt;
	}

	public void setUpdateDt(Date updateDt) {
		this.updateDt = updateDt;
	}

	public Integer getVersion() {
		return version;
	}

	public void setVersion(Integer version) {
		this.version = version;
	}

	public String getValidateName() {
		return validateName;
	}

	public void setValidateName(String validateName) {
		this.validateName = validateName;
	}

	public String getValidateContent() {
		return validateContent;
	}

	public void setValidateContent(String validateContent) {
		this.validateContent = validateContent;
	}

	public String getState() {
		return state;
	}

	public void setState(String state) {
		this.state = state == null ? null : state.trim();
	}

	public String getDeleteFlag() {
		return deleteFlag;
	}

	public void setDeleteFlag(String deleteFlag) {
		this.deleteFlag = deleteFlag == null ? null : deleteFlag.trim();
	}

	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder();
		sb.append(getClass().getSimpleName());
		sb.append(" [");
		sb.append("Hash = ").append(hashCode());
		sb.append(", sid=").append(sid);
		sb.append(", createBy=").append(createBy);
		sb.append(", createDt=").append(createDt);
		sb.append(", updateBy=").append(updateBy);
		sb.append(", updateDt=").append(updateDt);
		sb.append(", version=").append(version);
		sb.append(", validateName=").append(validateName);
		sb.append(", validateContent=").append(validateContent);
		sb.append(", state=").append(state);
		sb.append(", deleteFlag=").append(deleteFlag);
		sb.append("]");
		return sb.toString();
	}
}

3、Thymeleaf 迭代语法：

<!--Thymeleaf迭代语句each  -->
			<tr th:each="obj : ${pageInfo.list}">
				<td th:text="${obj.validateName}"></td>
				<td th:text="${obj.validateContent}"></td>
				<td th:text="${obj.sid}"></td>
				<td th:text="${obj.createBy}"></td>
				<td th:text="${#dates.format(obj.createDt,'yyyy-MM-dd')}"></td>
				<td th:text="${obj.updateBy}"></td>
				<td th:text="${#dates.format(obj.updateDt,'yyyy-MM-dd')}"></td>
				<!--Thymeleaf 判断语句:if 和 switch  -->
				<td th:if="${obj.state} == 1" th:text="启用"></td>
				<td th:if="${obj.state} == 2" th:text="禁用"></td>
				
				<td th:if="${obj.deleteFlag} == 1" th:text="未删除"></td>
				<td th:if="${obj.deleteFlag} == 2" th:text="已删除"></td>
				<td>
					<a th:href="@{/api/column-validate/insertPage}" class="btn btn-info btn-sm">修改</a>
					<a th:href="@{/api/column-validate/insertPage}" class="btn btn-info btn-sm">删除</a>
				</td>
			</tr>

Thymeleaf 判断语法：

	<!--Thymeleaf 判断语句:if 和 switch  -->
				<td th:if="${obj.state} == 1" th:text="启用"></td>
				<td th:if="${obj.state} == 2" th:text="禁用"></td>
				
				<td th:if="${obj.deleteFlag} == 1" th:text="未删除"></td>
				<td th:if="${obj.deleteFlag} == 2" th:text="已删除"></td>

Thymeleaf switch语法：

<!-- th:switch / th:case -->
<div th:switch="${user.name}">
  <p th:case="'admin'">User is an administrator</p>
  <!-- *: case的默认的选项 -->
  <p th:case="*">User is some other thing</p>
</div>