今天遇到一个需求是，让我传入一个实体类，但是要求我返回的是另一个实体类，此时就考虑使用ModelMapper（get，set也可以但是很麻烦）

将实体类对象转换

    @GetMapping("/{id}" )
    public R getById(@PathVariable("id" ) Integer id) {
        return R.ok(bigOthNppReportService.getById(id));
    }
	@GetMapping("/{id}/list" )
	public R getById_list(@PathVariable("id" ) Integer id) {
		BigOthNppReport byId = bigOthNppReportService.getById(id);
		ModelMapper modelMapper = new ModelMapper();
		BigOthNppReportSimple bigOthNppReportSimple = modelMapper.map(byId, BigOthNppReportSimple.class);
		return R.ok(bigOthNppReportSimple);
	}

列表转换

	@ResponseExcel
    @GetMapping("/export/detail")
    public List<BigOthNppReport> export(BigOthNppReport bigOthNppReport) {
        return bigOthNppReportService.list(Wrappers.query(bigOthNppReport));
    }
	@ResponseExcel
	@GetMapping("/export/list")
	public List<BigOthNppReportSimple> exportList(BigOthNppReport bigOthNppReport) {
		QueryWrapper<BigOthNppReport> wrapper = Wrappers.query(bigOthNppReport);
		List<BigOthNppReport> list = bigOthNppReportService.list(wrapper);
		ModelMapper modelMapper = new ModelMapper();
		List<BigOthNppReportSimple> map = modelMapper.map(list, new TypeToken<List<BigOthNppReportSimple>>() {
		}.getType());
		return map;
	}

使用流的对象重构

@Override
	public IPage<BigOthNppReportSimple> getBigOthNppReportPageSimple(Page page, BigOthNppReport bigOthNppReport) {

		Page<BigOthNppReport> page1 = new Page<>(page.getCurrent(), page.getSize());
		LambdaQueryWrapper<BigOthNppReport> wrapper = new LambdaQueryWrapper<>();
		wrapper.eq(Objects.nonNull(bigOthNppReport.getRptNd()),BigOthNppReport::getRptNd,bigOthNppReport.getRptNd())
				.like(StrUtil.isNotBlank(bigOthNppReport.getPublishOrg()),BigOthNppReport::getPublishOrg,bigOthNppReport.getPublishOrg())
				.like(StrUtil.isNotBlank(bigOthNppReport.getNppOrg()),BigOthNppReport::getNppOrg,bigOthNppReport.getNppOrg())
				.orderByDesc(BigOthNppReport::getId);
		Page<BigOthNppReport> pageList = page(page1, wrapper);

		return pageList.convert(item -> BigOthNppReportSimple.builder()
				.id(item.getId())
				.rptNd(item.getRptNd())
				.no(item.getNo())
				.theme(item.getTheme())
				.publishOrg(item.getPublishOrg())
				.nppOrg(item.getNppOrg())
				.crewNo(item.getCrewNo())
				.reportDate(item.getReportDate())
				.writeName(item.getWriteName())
				.writeTime(item.getWriteTime())
				.flag(item.getFlag())
				.build());
	}